At first, the puzzle seems simple: water flows through pipes toward seven glasses, so one must fill. But that assumption relies on quick visual processing.
A closer look reveals broken connections, tiny gaps, and dead ends. Many pipes only appear connected, tricking the eye into seeing a continuous path.
When checked carefully, every route is blocked—there’s no complete path from the source to any glass.
Conclusion: none of the glasses get any water. The puzzle tests attention to detail and shows how easily perception can mislead us.