Humans have been putting animals on walls, using natural pigments, for a very long time.
The students studied the cave art of Lascaux, France as their masterwork for this project. The experience included entering a nearly-dark classroom lit only by a few candles, with ambient water dropping and other recorded cave sounds playing. The students lay down beneath their desks and drew animals with chalk on the undersides by candlelight.
The project is beans. When describing it to people, most of them seem to picture some sort of kindergarten-level macaroni art. They scoff and roll their eyes. How cute that the kiddies get to do a little art project. This is so much more than that.
Good thing the panels are metal. Art pieces that partially covered a panel edge were screwed to the wall on one side with hinges, and strong magnets affixed the panel to the metal.
In the picture above, #30 is glued to the door of one of the panels. The larger box around it represents the edge of the panel housing, with large bolts holding it in place. Pieces #23, #31, #29, #36, and #37 all have hinges shown with triangles.
Keeping their dimensions in mind, the students each selected an image of their biome project's focus animal and I simplified each image to a few key colors for them.
Using the limited range of colors available in beans, students planned which beans would represent which colors on their design with varying degrees of difficulty depending on the animal—there are no blue beans.