In a pitch-black cave, shapes form that mimic those outside but no light enters. What causes these illusions of form?
Category: Story · Difficulty: hard
Hint: Some living things create light from within.
Answer
Reflections from bioluminescent creatures
Explanation
Bioluminescent organisms inside the cave reflect and create shapes resembling shadows even in total darkness.
This is a hard story riddle — a tricky one that takes a little thought. The answer is Reflections from bioluminescent creatures.
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