One picture is worth one thousand words

The goal of the game is to match a pattern built with 4 rectangles, by manipulating 4 pictures located in the center of the screen. The catch is that they are not static pictures, but diaporamas. You actually see the current picture of each diaporama. To complete your task, two moves are available: you can advance to the next picture of a disporama, or you can swap two diaporamas' positions.