Sandro del Prete
On the table lies an open book. The illustration represents a hand turning a page. You can recognize the image on the subsequent pages: a reproduction of the same image, getting progressively smaller and smaller, creating an impression of depth. The accompanying text of the first page is in striking contrast to the image depicted: it reads, "This is a flat image"!
But should you feel dizzy while looking at the picture, just follow the instruction in the title, and: "Turn, please!"