This puzzle was described in the Print Queue column of the November, 1991 issue of BYTE magazine, page 447.  The segment of the article describing this puzzle reads:
 . . . Draw a big enclosing rectangle.  Inside it, draw, left to right, three small boxes, A, B, C, each snug against the bottom edge, where nothing can pass beneath them.  Up above, draw, left to right, three small boxes, C, B, A, of which only B is snug against the top edge, where nothing can pass above it; C and A float free.  Now draw three lines, A to A, B to B, C to C, no line touching either another line or the enclosing frame.
	Pickover tried that on "450 scientists," of whom 20 percent said it was impossible.  The rest solved it in from zip up to 6 minutes; their ages ranged from 20 to 60 years, and an interesting graph ties the slowest times to some of the youngest subjects.
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	There are at least two solutions to this puzzle, although one is a mirror of the other.

Good luck!!