I saw this sometime last week, but I cannot recall where. I looked through the last two issues of the New Yorker and it wasn’t there.
It showed two or three men on high steel. But it wasn’t ordinary high steel, but an impossible design. One of the men is shouting down: “Escher, get your ass up here.”
Maybe this?
Crap! I’ve been Merc-ed!
Triple play!
Three correct answers to a question in four minutes. We may have a new record.
Well if you look at the impossible steel it *does *form a triangle. 
Bingo. All of the above. So it was the New Yorker. Does anyone know when? Why couldn’t I find it. I went through the last two page by page.
Is it just me; I think it would have been funnier if the caption was “Escher, get your ass down here!”
Alternatively, the guy who’s yelling could be looking up.
There’s actually text at this link:
According to it:
All typos from original sources.
Or standing sideways on one of the upright beams. 
The other guy should be standing on the bottom of the other beam.
