A little electronic pen for wannabe engineers that will tell you the composition of anything you touch it to. A lot of toys have dyes that change color with temperature so you can touch them and make them change color. Kids should be able to paint with this stuff. Particularly their walls, so they can then finger paint the temperature-sensitive regions. This toy can track specific color on surfaces.
Kids draw a line, it follow the line by color sensor.
So, kids get to understand the behaviors and relation to the color, they can control the toy's motion by drawing lines with several colors. This objects has small screen which show a certain colors. If two kids who have them meet and play with them, colors can be exchanged by IR and it can memorize the other's color by identifing the signal. If the number of playing with each other increase, color become to be similar. Musical Painting A special canvas with a camera that interprets the different colors applied, type of brush with which the color is applied, and speed with which the paint is applied and translates it into musical tones, allowing the painter to compose a musical score that reflects the mood and tone of the painting.