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Slight spoilers:

For anyone else who gets stuck at the bottom of the well (left path) -- the dots correspond to what you're supposed to do. Find a pattern, use trial and error. You're not done until you've picked up an item. 
You will have to backtrack.

Can... someone explain the "Nasca et al." blue dots illusion? What am I looking for?? The rest of the game's fun, but this has me stumped.