Keying in on Gestalt

I toyed with a handful of ideas and ultimately just decided to go with a very simple image that powerfully illustrates Gestalt principles. Here are the principles I used:

SIMILARITY: Each of the shapes are similar in size, shape, and color, so they are perceived as if they go together in a group.

CLOSURE: Even though this picture is only a collection of lines and rectangles, our mind closes the gaps to form piano keys.

Also, I've enjoyed playing the piano since I was a little kid.