Riddle Pillows
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Description: A row of emeralds reaches the line of time T, where the prediction forks into a green emerald and a blue one. Why do we expect emeralds to stay green rather than turn 'grue'? Define 'grue' as green if observed before time T, blue after. Every emerald seen so far is both green and grue. The evidence supports both predictions equally; why do we trust only one? Source: Nelson Goodman, Fact, Fiction, and Forecast, 1955. Designed as a clean scientific plate that reads at a glance and rewards a closer look.
