I made this a long time ago - probably in the 1970s. It's little cubes of wood cut so columns of them "rotate", which is accentuated by painting the sides in different colours. I don't think I realised that this would create waves - easier to see if you look at the work from the side (no photo from this vantage point at present).
I must have given it to my parents. It got "rediscovered" when they moved to Wiltshire and my sister Sonia now has it hung on her chimney breast.
Just recently I've been considering repeating this in a different material, possibly glass or ceramics.