Gerald Conn's Whale Song

Whale Song is a 1989 sand-on-glass film by Gerald Conn. It's haunting evocation of mankind's relationship with marine life over the centuries, and from a stylistic point of view is also notable for an interesting sequence where the sand animation is used to imitate primitive computer graphics.

Incidentally, the version on YouTube is lower quality than the Vimeo copy above, but has full credits.