RIBFALL · Every Rib Chooses Two Rivers

RIBFALL is an original portrait-first umbrella-work puzzle. Every triangular oil-paper panel lies between two bamboo ribs and sends its entire measured shower toward the lower one. Moving a single rib therefore rewrites both neighboring rivers. Carve the frame so every engraved rim cup receives its exact volume, no panel pools, and the sum of chosen notch heights matches the contract ledger.

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