Manmade

This line is a bit contrived, although a good challenge for those looking to up their technique. It's a stemming problem in the right-facing corner, where your feet are allowed on the right side (the bricks/stones) and your hands are only allowed on the left side of the wall (blank).

It is just to the left of

Shittin' Bricks

in the left-facing corner.

Nothing unless you fall.