For Color class, we had to do a project on simultaneous contrast, or the effect that happens when you put different colors next to each other. We had to make a light gray and medium gray look the same by manipulating the background colors, and the same with medium and dark gray. Then we expanded it into monochrome and analogous colors.
I chose to present mine as if it was a toy kids could buy. I made cards where the "background" color swings on top of the colors that are supposed to look the same, and can swing backwards so you get two illusions on each card. I also designed some packaging to bring the whole thing together.
Let me know in the comments if you have any questions!