Ditch Day 2015 in Photos

On May 22nd we celebrated Ditch Day, one of Caltech's oldest traditions. During this annual spring rite—the timing of which is kept secret until the last minute—seniors ditch their classes and vanish from campus. Before they go, however, they leave behind complex, carefully planned out puzzles and challenges—known as "stacks"—designed to occupy the underclassmen and prevent them from wreaking havoc on the seniors' unoccupied rooms.

Find more photos on Caltech's Facebook, Twitter, and Instagram pages and see how the undergraduates tackled the puzzles left for them to solve around campus.

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