For 7 years, a diligent Japanese custodian worked on the maze you see above. Twitter user @Kya7y (and daughter of the artist) found the drawing recently and posted it for the world to see.  Apparently, it was completed almost 30 years ago in his spare time using some pen and ink on A1 size paper (841 x 594 mm).

What is maybe most impressive, however, is that the drawing was made with very little planning.
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He simply drew the maze as it popped into his mind.

I hope this is sold as a print some day.
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 I’ll hang it on my wall, and spend the next 7 years trying to solve it.

-RSB

[via Colossal]