Accidental Montessori: Sorting Buttons

I was using plastic buttons today for a project - my son, E, came into the kitchen and his eyes lit up.  He's always loved buttons and I keep a jar on my dresser which he plays with every morning whilst I get ready for the day.  These were NEW and SHINY buttons and he needed them immediately.  After dumping them out and telling me all about the colours he started picking out the biggest of them stating they were 'BIG, GIANT buttons'.  I got some bowls for him and he started to sort them out by size, all the while describing the colours and whether they were tiny, small, medium or giant.

All in, this accidental button sorting took about 20 minutes before he moved on.