I had to do a Piaget Interview for my cognition class and decided to use jelly beans as the main ingredient. I interviewed the kidlets on conservation, ego-centrism and problem solving. We had a blast but maybe it was the jelly beans.
For the problem solving part of the interview, we played the memory game with the egg halves. I thought that maybe it would be too easy for the eight year olds but as it turned out, it was just hard enough and the five year old made enough matches to sing and dance too. Check it out: