Pythagoras in 60 Seconds

Short film by Alan Kitching, made in 1986. Apart from explaining the famous theorem, it is also conceived as a "visual proof"... ie, whereas a still diagram can show a single instance of something, animation can show all possible instances... and that can make the difference between a simple illustration and an actual proof.
The music is Ponchielli's "Dance of the Hours", from the opera La Gioconda.
For today's Antics 2-D animation software, see Antics Workshop at www.antics1.demon.co.uk.