mirror of holland
This year's Nederlands Film Festival has a program called Mirror of Holland, a retrospective of Dutch cinema of the past 30 years as "cultural-historical documents". The program's title pays homage to Bert Haanstra's classic short documentary 'Mirror of Holland' ('Spiegel van Holland', 1950), which won a Palme d'Or in Cannes.

Composed entirely of reflections in water, the film has the quality of a moving painting which gets increasingly abstract as the images are distorted by ripples. Its visual poetry is simply timeless.
As I'm not sure the festival actually shows Haanstra's film, here it is online.