It's a joke." The futurist devotees were indignant, but there were enough who were stung by faint suspicion to investigate.

They studied that signature upside down and under a microscope.

After a while they got the identity of the man responsible for it, and--we draw a veil over the rest! Then there was the man--another one--who, by way of a cheerful experiment, painted a post-impressionist picture with a billiard cue, jabbing gaily at the canvas as though trying to make difficult screwed shots, caroms and so on.

Having done his worst in this way, he then took his picture to a gallery and exhibited it upside down.

It attracted much attention and a fair quota of praise.
Stories such as these might discourage one if one did not keep remembering that even in far deeper and greater affairs of life, "A hair perhaps divides the false and true." Who are we to improve on Omar's wise and tolerant philosophy?
I have less sympathy with the girl who wrote poetry, and even occasionally sold it, at so much a line.