Many people walk past without realising the marco numbers hidden behind this black and white line art drawing.
This is a wall panel inside the Modern Museum in Stockholm Skeppsholmen. You could walk pass it thinking it is a normal line art sketch, but closeup, you can "see the difference" - every single step is painstakingly build on chronological numbers. Lines are first drawn with pencil marking and then artist have to slowing fill it in with numbers using black marker pen. Please see workshop for the macro versions.