Activity
SensorialUse what you own
Sorting by size, three bowls
Trains the visual discrimination that every graded Montessori material later depends on.
- Ages
- 2–3, 3–4 years
- Prep
- 5 minutes
Build a week around this activity
A week gives you what to gather, one change at home and one thing to observe. It starts with four short questions about your child and your home.
Readiness signs
Signs to look for, not a checklist to pass.
- Groups things spontaneously
- Notices when something does not belong
- Uses a pincer grasp
What to gather
Three bowls and two clearly different sizes of pasta or buttons, a tray
How to present it
Show it slowly and in silence. Your hands are the lesson.
- 1Put the mixed objects in the middle bowl and leave the outer two empty.
- 2Pick up one object, look at it, and place it in one outer bowl without speaking.
- 3Do three or four, then slide the tray toward your child.
- 4When it is finished, mix them back together for the next time.
What to say — and what to avoid
Say
- These go here.
- You finish it.
Avoid
- No, that is the big one
- Are you sure?
Control of error
A mixed bowl at the end is visible to the child without you naming any error.
What to observe
Take these into the next cycle rather than judging the session.
- Does your child correct their own sorting?
- Do they sort by a rule you did not name, like colour?
- Do they repeat it once it is easy?
Simplify or extend
If it's too hard
Use two bowls and two very different objects.
Once it's mastered
Add a third size, or sort by two attributes at once.
Sources and review
Nothing publishes here without a named reviewer and the sources it rests on.
Reviewed by Nicole · August 2026
- The Discovery of the Child — Maria Montessori. Sensorial education