We borrowed this strange book many times from the library when my sons were small in the late 1960s. It was an American publication, as the creatures played ‘tic tac toe’ which we would call noughts & crosses. Quite a large picture book – little text I think, very detailed soft grey illustrations with small animal characters in greyscale photographic collage on (pencil-drawn?) landscapes. A very peculiar book indeed, dream-like with a minimal plot and not like anything else I’ve ever seen.