Create a light box. It doesn't have to be exactly like the one in the picture. You can insert styrofoam spheres. You can spray paint. You can insert a light source.
Bring it to class in a plastic bag for protection from rain.
Visit the OpenGL home page. Visit the Open Inventor home page. Print out and read this paper on VRML. Add it to your notebook. Visit vrmlworks. Visit the x3d FAQ page. Visit www.webtop.org and run one of the examples. Cosmoplayer often crashes Netscape on the SGI -- don't keep trying; just give up if this happens to you.
Display the light box geometry using /usr/sbin/ivview and then convert it to vrml format (suffix = .wrl) using /usr/sbin/ivToVRML and view it in a Web browser with the cosmoplayer plugin from cosmosoftware. Take a screen shot and insert it in your Web page. Link it to the .wrl file.