Seattle artist and illustrator Marlin Peterson was commissioned by the Washington State Artist Trust to paint a mural somewhere in the city, and he chose the rooftop of the Seattle Center Armory (formerly the Center House), visible from right underneath the Seattle Space Needle. He painted two daddy long-leg spiders using a technique called trompe l’oeil, which creates an overhead optical illusion, to make it seem like spiders are taking over the building.

[Via Thisiscolossal]