The advanced artist can lead the eye astray: the viewer believes that the floor is the wall, tomato cans are philosophic, even that a bagpipe really is an instrument. Practiced well, this mastery can lead to fame, lucrative sales, and more receptions with those little cocktail weenies on-a-stick.
This is a steel-cable guard rail, and some small lava rocks.
August 6, 2010. Craters of the Moon National Monument, Idaho.