Yes, that exists and we have one. On our refrigerator at home. And it looks like this.
A quite simple, 3-circuit labyrinth in 2 different shapes cut out from a piece of paper. On the left picture the boundaries are cut out and show the colour of the refrigerator, the path inside is in red. On the right picture it is contrarily as the cutten part is clued to the refrigerator. Or negative and positive. But not really. Because together there is only one sheet of red paper.
Quite simple, but one must have the idea. Who was it? The idea and execution are from our Anne, which likes to work also as a mosaic artist. The mirror from which you see a part in the next picture is also her creation. And Anne is standing between her works.
From this place cordial thanks to Anne and Peter for the kitchen renovation together with the artistic transformation.