This is the logo of the Tor Vergata University in Rome, made 3D with the POV Ray raytracer. The POV code has switches for adding animation, that e.g. can be made using tools like gifsicle and Netpbm to convert from PNG to GIF, when povray does not support GIF output directly. You can/have to play with antialiasing, background color, and so on to make it look better. [See Meta(font) section too]
A very simple optical periscope, made of three mirrors and two
simple lenses, showing a surface with an image that is on a surface
which is above the plane of the camera (in fact you can see the
dark down-side of that surface
). Thumbnails inside show
the use of periscope with two different kind of optical guard
ring (play with the switches in the POV source!)
A magnification lens widely based on the example given in POV Ray,
magnifying a painted
surface. (Thumbnail inside show another
image).