The composition idea for series of prints I'm working on is pretty simple ... just two differently-sized circles of colour wandering over to each other on a white background. You can find a lot of precedent for that sort of thing:

Bridget Riley's 'Kiss' from 1961, the first painting in her mature style and already a lot bolder than anything I'm planning.

Terry Frost's 'Red Black and White' (1967) ...

I think a lot of the impetus for these sorts of pictures comes from Swiss graphic designer Josef Müller-Brockmann, who was doing some superb work with circles in the 1950s. I think Riley would have been aware of him as she was working in an ad agency around then. Here's a 1958 poster by Müller-Brockmann:

Much less 'artistic' perhaps, but very much to my taste.