This model is made out of two types of tiles, the yellow tile, and the black tiles. The black tiles change color according to their value of "it" (the yellow tile). The tiles closer to the "it" tile, has higher value of "it". There are two types of color demonstratin. In the first demonstration, the "brighter" the black tile is, the higher value of "it" it possesses. In the second demonstration, the "pinker" the tile is, the higher value of "it" it possesses. To navigate between the demonstrations, press the SPACE BAR.