Dada is not your father.

Marcel Duchamp plays chess.
He plays art like a chess player.
Carefully, according to the rules.
He has some suprise moves.
He surprised some with his painting, "Nude decending staircase".

I've heard a story told about him about a person
asking him about that painting.
Something like.....

She say's to Marcel...
"That looks nothing like a woman."
Marcel replies...
"It's not a woman Madam. It's a painting."

Dada is nothing.
Unless you can tell me something.