What do you make of this? It’s an exterior wall with a door, and a letterbox to the left of it. That much is obvious. Then there is a labyrinth of markings – many in white but some in black. Relics of where there was electrical trunking or shelving perhaps? A graffiti artist has added some embellishments. And finally towards the bottom left there looks like a line drawing of something that resembles an open box with the flaps of the top turned out and down.
There’s a lot we don’t know, and never will. It’s a puzzle, but I rather liked it.