Is this some sort of Harry Potter style walkway? You just need to believe it strongly enough and then it will be there?
Or has Wile E. Coyote been busy? I am sure I saw an episode where he painted a “cave” into the side of a mountain to try and trap the Roadrunner when the bird ran into the wall.
Or perhaps I’m just being to limited in my acceptance of the many people in the world who can walk horizontally along walls?
Clearly, it’s meant for spiderman.