The kiddies painted a 2.5 diameter circle as requested by Mummy, but without knowing the reason why.
The were bemused but amused :)
We totally ran out of paint but they didn't care when I told them the green circle they had just painted is the size a lily pad in the Amazon River.
Making a tin foil river. The children loved this and played with it on and off all day.
They learnt and understood the words: meandering and deposition.