A grade 10 science build with one requirement: display the major components of the human eye. I went 3D to show the parts clearly, and made it telescopic so the important internal features could be pulled apart and seen — built entirely from scrap wood, PVC pipe, and plastic bowls and dishes.
Cut, glued, and painted scrap wood for the base, with a 1.25″ hole for a 1.25″ PVC tube. The back half of the eye is a plastic bowl bored for the tube. The iris and pupil were painted onto a small plate assembly glued to a 0.75″ PVC pipe. The lens is two plastic dishes glued together, drilled for dowels and a 1″ center pipe.
Nesting the 0.75″, 1″, and 1.25″ assemblies inside one another created the full telescopic model that extends to reveal each internal feature.
Not a technical project, but a showcase of creativity and resourcefulness — my grade 10 teacher kept it and still uses it as a classroom teaching aid.