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Homeschool Montessori

Metal Insets

Metal insets are ten pink metal frames, each holding a blue geometric shape with a small knob. A child of about 3.5 traces the inside of a frame, then the shape itself, in two colors, and fills the figure with careful strokes. Montessori counted one filled figure as much hand practice as ten copybook pages of strokes.

By Owen WrenPublished Last updated

Sourced from the texts, not yet presented at home

At a glanceLanguage · 4 of 12
Typical age3.5 to 6 years
AreaLanguage
Before this
Materials
Direct aimTo control a pencil: tracing an outline, then filling a shape with even, parallel strokes.
Control of errorThe frame and the outline. The metal edge guides the pencil, and when filling, any stroke that crosses the line shows. Montessori read a child's pencil control from the strokes, which start short and confused and grow long and parallel, inside the line.
Leads toLater lessons in this line are in preparation.
TimeAbout 15 minutes (our estimate).
GroupingOne child at a table
Parent prepLow. The insets on their stand, a small tray, paper cut square, and colored pencils.
CostBuy about $57 to $194. Make: possible to make with some effort.
Other namesIron insets, Metal geometric insets, Insets for design
Illustration: the Montessori metal insets, pink frames holding blue insets, standing in a wooden rack.
IllustrationMetal insets in their rack.
Montessori metal insets, ten frames on two sloping boards, Fig. 28 in Dr. Montessori's Own Handbook, 1914
From Dr. Montessori's Own Handbook (1914)Fig. 28, sloping boards to display the set of metal insets, as printed in Dr. Montessori's Own Handbook (1914). Public domain.

What the work teaches

Direct aim. To control a pencil: tracing an outline, then filling a shape with even, parallel strokes.

Indirect aims, the ones you will not see at once

  • Preparation for writing: the three-finger grip and light, steady pressure
  • Shape names and an eye for geometric figures
  • Choosing colors and putting them together
  • Concentration, and care with paper and pencils

Set it out before you invite the child

Ten metal frames, each with a blue inset that lifts out by a small knob. Montessori Outlet, Nienhuis and The Montessori Room all list pink frames and blue shapes; Alison's lists each inset at 5.5 inches square.

Montessori's 1914 set looks much the same: ten pink metal frames with blue figures, set out on two sloping boards of five, with a box of ten colored pencils. Her 1912 set had brown frames with dark blue centers, on two small sloping tables.

Most albums add a small tray, paper cut to the size of the frame, and a holder for three pencils. That's later practice, and it keeps the frame square on the paper.

A table and chair, with the stand where the child can see all ten shapes at once.

Presentation, step by step

  1. 1Invite the child to the stand. Choose the square or the circle, and carry frame and inset to the table on a tray with paper and pencils.Say "I'll show you the metal insets." Then carry them in silence.
  2. 2Lay the frame on the paper. Hold it down with a flat hand and trace the inside edge with a colored pencil, slowly, all the way round.Silent Firm hand on the frame, light pencil, slow.
  3. 3Lift the frame. Lay the blue inset on the drawn shape and trace around it in a second color.Silent Pick a new color for the second outline.
  4. 4Lift the inset away. The figure now has two outlines in two colors.Silent Lift the inset slowly so the child sees both lines.
  5. 5Fill the figure with strokes from one line to the other, each stroke staying inside the outline.Silent Slow, even strokes from line to line.
  6. 6Invite the child to make one, then return the frame and inset to the stand.Say "Would you like to make one?"

Details that hold the child's attention

Lifting the frame and finding a shape drawn on the paper.

Two outlines in two colors, one inside the other.

The knob. Montessori saw children add a small orange circle in the middle of their drawings to stand for it.

A drawer slowly filling with the child's own figures.

How the child sees a mistake

The frame and the outline. The metal edge guides the pencil, and when filling, any stroke that crosses the line shows. Montessori read a child's pencil control from the strokes, which start short and confused and grow long and parallel, inside the line.

Montessori’s name for this check is the control of error.

The words come after the hands

Vocabulary
WordsShown with
frameThe pink square with the shape cut out.
insetThe blue shape that fits it.
outlineThe line the pencil leaves around a shape.
square and circleThe first two shape names, given once the child has drawn both.

The three-period lesson, scripted

You need the square and the circle insets.

The three periods
PeriodWhat you do and say
1. Naming"This is a square." "This is a circle."
2. Recognition"Give me the circle." "Give me the square."
3. RecallPoint to one and ask "What is this?"

Montessori began shape names with the square against the circle, two strongly contrasted forms, and taught only the familiar ones.

Where the three periods come from, with Montessori’s own example: the three-period lesson in the glossary.

Extensions and variations

  • Combining two insets in one drawing, overlapping or one inside the other
  • Using a frame and an inset of different shapes together
  • Filling with strokes in a new direction, or with short strokes
  • Coloring outline designs, as in the book of drawings Montessori prepared
  • Binding the child's best figures into a small booklet

Variations

  • Starting with straight-sided shapes, which are easier to trace than curves (our suggestion)

Make it or buy it

Make or buy, with approximate prices
MaterialMake itBuy, approx.
Metal InsetsWith effort$57 to $194

Prices noted . Approximate US street prices for home-use versions; they vary by maker and change often, so recheck before buying.

Making it at home

Frames and shapes cut from stiff card or thin plastic make a working set. Metal is easier to trace and lasts.

What to check when buying a set

Check edges for burrs and that each inset lifts out cleanly by its knob. Stands are useful but optional.

Printables for this age

This work needs only the material, so it has no printable of its own. The shelf plan below places it among the other works for the same age.

  • Shelf plan for age 3PDF, 1 page, 250 KBEvery work for this age on one page, in order, with a column to date each presentation.

Free to print for your family, no email needed. Print at 100%, not “fit to page”, so the drawings keep their scale. Every printable on the site is listed on the printables page.

Every printable for one age, by email

The shelf plan and the lesson printables for your child's age in one email, then three short emails on the first lesson, what to make or buy, and what comes next.

Signs the child is ready, and signs it is done

Ready for the first presentation

  • Holds a pencil with three fingers.
  • Works the knobbed cylinders with a careful pincer grip.
  • Colors inside a large shape on paper.
  • Sits at a table for ten minutes.

Ready for the next lesson

  • Traces frame and inset without the frame slipping.
  • Fills a figure with even, parallel strokes inside the line.
  • Combines two insets in a design, unprompted.
  • Asks to write letters on paper.

Fitting it into a home, not a classroom

Homeschool adaptations
If you haveDo this
A tight budgetCut frames and shapes from stiff cardboard or thin plastic, such as a lid. A metal edge is easier to trace, but card works for a start.
A left-handed childSet the pencils and the stand on the left, and show the tracing with your left hand if you can.
A toddler siblingPencils and metal frames aren't toddler tools. Use the insets while the toddler naps.
Little table spaceOne frame, one sheet and three pencils on a tray is the whole work. The stand can live on a shelf.

When it does not go to plan

Common problems and what to do
WhenTry this
The frame slides while the child traces.Show the flat hand holding it down again. A sheet of non-slip mat under the paper helps.
The child scribbles instead of filling.Leave it. Montessori saw first fillings as short, confused strokes that grew longer and more even with practice.
The pencil point keeps breaking.Show a light stroke again, slowly. Pressure eases with practice.
The child only ever chooses the circle.Let them. Keep all ten shapes on show in a row: Montessori found children wanted to draw every inset they could see.

Hazards to check before each session

Check the frames and insets for sharp corners or burrs, especially on budget sets.

Draw sitting down, and carry pencils point down.

Where other sequences and standards place it

We have not bought the paid homeschool curricula, so they are not listed here.

Where this lesson sits in other sequences and standards
FrameworkWhere it sits
This site's Language sequenceLesson 4 of 12 published, after Knobbed Cylinders and Geometric Cabinet (Plane Geometric Insets). Checked in: the scope and sequence
Montessori, The Montessori Method (1912)Fourth grade: the child passes to the geometric insets in metal, traces them with a pencil and fills them in, while starting the sandpaper letters. Checked in: Chapter XX, Sequence of Exercises
Montessori, Dr. Montessori's Own Handbook (1914)Writing, the management of the instrument: two sloping boards of five pink frames with blue figures, ten colored pencils, a book of designs. Checked in: Writing, Fig. 28
Common Core, Kindergarten mathK.G.A.2: correctly name shapes regardless of their orientations or overall size. Checked in: tasks.illustrativemathematics.org
Head Start Early Learning Outcomes Framework, preschoolP-PMP 3: the child demonstrates increasing control, strength and coordination of small muscles. Checked in: www.in.gov

Metal Insets: questions parents ask

What are metal insets in Montessori?

Ten metal frames, each with a geometric shape that lifts out by a knob. The child traces the frame and the shape onto paper and fills the figure with pencil strokes. It's preparation for writing, done with drawing.

What age are metal insets for?

About 3.5, once the child holds a pencil with three fingers, and on this site up to 6; older children keep using them for designs. Montessori placed them in her fourth grade of exercises, alongside the first sandpaper letters.

Why do metal insets help with writing?

They train the pencil hand without the strain of forming letters. Montessori found that filling one figure made the child repeat the writing movement as often as ten copybook pages of strokes, and the strokes grew even with practice.

Do I need the stands?

No. They display the ten shapes in a row, which Montessori found made children want to draw them all. A shelf where all ten can be seen does the same.

Sources cited by book and chapter

  1. Maria Montessori, Dr. Montessori's Own Handbook (1914)

    Writing, Fig. 28

    Two sloping wooden boards each hold five square metal frames colored pink, with a blue geometrical figure provided with a small button for a handle, used with a box of ten colored pencils.

    Writing

    The child lays the iron frame on the paper, holds it down firmly and follows the interior outline with a colored pencil, then places the blue figure on the outline and draws round it in another color.

    Holding a pencil like a pen, the child fills the figure with up and down strokes, at first clumsy and outside the outlines, later finer, parallel and within them.

    When the ten metal insets are arranged in a row before the child, rather than handed out, he wants to draw them all, and the number of exercises increases.

  2. Maria Montessori, The Montessori Method (1912)

    Chapter XVII, Description of the Method and Didactic Material Used

    The top of each little sloping table holds square frames painted brown with centres of the same dark blue as the metal insets.

    Filling in one figure makes the child repeat the movement needed to fill ten copybook pages with vertical strokes, without weariness.

    Many children make a little orange circle in the centre of the figure to represent the brass button by which the metal piece is held.

    The strokes grow longer and more nearly parallel until the figures are filled with regular up and down strokes, which shows the child's maturity in holding the pencil.

    Chapter XX, Sequence of Exercises

    The child passes to the plane geometric insets in metal, follows the contours with a pencil and fills in the figures, and contemporaneously learns some sandpaper letters.

    Chapter XV, Intellectual Education

    Lessons in the names of forms begin with two strongly contrasted forms, the square and the circle, and only the most familiar names are taught.

Lesson text and the scope and sequence are CC BY 4.0: reuse them with credit to Owen Wren, Homeschool Montessori, and a link. Photos and illustrations are all rights reserved. The plates from Montessori's 1912 and 1914 books are public domain and not ours. Terms.

Reviewed by

Not yet reviewed. No credentialed Montessori guide has checked this lesson. When an AMI or AMS trained guide reviews it, their name goes here. How pages are written

What to offer next

Language, lesson 4 of 12 published, by starting age

Once the child chooses this work unprompted and finishes it without help, the next lesson to prepare is Pink Series: Object Box Reading.

  1. Sound games2.5 to 4.5 years
  2. Moveable alphabet3.5 to 6 years
  3. Metal Insets3.5 to 6 years
  4. Pink series4 to 6 years
  5. Three-part cards4 to 6.5 years

Not sure where this fits for your child? Two minutes of questions gives you a starting shelf.