GIF-animation

Rotation of the figure that forms the impossible triange (GIF - 71K)	Animated Escher's image "Ascending and Descending" (GIF - 40K)
Escher's waterfall with gargoyles (GIF - 600K)	Threee animated wireframe triangles
Animated impossible triangle of cubes (GIF - 220K)	Animated endless staircase (GIF - 240K)
Animated impossible ring (GIF - 950K)	Animated artworks by Bill Tavis (GIF - 144K, 258K)
Animated impossible band (GIF - 507K)	Animations by Owen Chikazawa (~5.5M)
Impossible construction (~1.0M)	Animation of impossible triangle (GIF - 970K)
Escher inspired animations (~1.0M)	Penrose Hug (GIF - 500K)
Animations with rainbow colors (GIF - 600K)	Animated Escher's Waterfall (GIF - 230K)
Animation of impossible rotating ring (GIF - 1.6M)	Twins in the Loop (GIF - 480K)

Other clips

http://www.photon.at/~werner/light/escher/anim.html
Rotation of crazy crate. This animation was made using raytracing program. Crazy crate is represented in perspective (not japanese projection). Crate's shadows were showed.