Is the cat going up the stairs or down?

catstairs.jpg


Is the cat going up the stairs or down?

How did you come up with your answer?
Up... no, down.
No, up.

How i came up with my answer:
I looked at it.

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The edge of the stair tread, often called the nose, overhangs the riser a nominal 1 1/4 inch (I did that from memory after building three houses by myself.) The puzzle may have been unsolvable had if it had been a typical cement staircase, where the tread does not have a nose.
 
Up the stairs. Very easy to see, by concentrating on the edge of the stairs. No way the cat is going down. If the cat was going down, he/she would be going in the opposite direction.
 
I've done "extensive research" on this. When questioned Erwin Schrodinger said he didn't know if there was a cat or not, but Sandy Dennis did confirm there was a cat and without question, the cat was walking down the up staircase.
 


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