i cut this from the Nina Paley video Panorama.
a beuatiful free short.

The way this works:
in NUVJ you can adjust the length of a clip while it plays by cutting the beggining and/or end off. Set this video to loop just the first part where the cat always has feet on the ground. and then slowly lengthen it and start cropping the beginning off. you can seamlessly make the cat walk for as long as you like and then run as long as you like and bring it back again. lots of fun.

check out Ninas feature length Sita Sings the Blues. shes posted all of her beautiful source files for artists to play with for free!