Two little mice are forbidden by their parents from playing with the differently looking blue mouse: All respectable mice are gray! We don't want anything to do with you! But the little mice ignore their parents' demands and play all together in a painter’s studio, jumping into pots of paint in different colors! The horrified parents are suddenly presented with three colorful mice, and they no longer know which ones are their own children. A story about accepting differences and how prejudices may be built on false assumptions.