You buy thisCognitive1½–3 yrsAt home
Nesting cups
Ten plastic cups that outlast every toy in the house.
Nesting cupsView on Amazon
View on AmazonPrep
0 min
Mess
None
How to play
Stack them into a tower, nest them inside each other, hide a toy under one, use them in the bath or the sandpit. Almost nothing does this many jobs.
What you need
A set of stacking or nesting cups.
What it secretly builds
CognitiveWorking out which cup fits inside which is size-ordering — the quiet foundation under counting and early maths.