Seasonal Duck-Rabbit

The Duck-Rabbit Illusion is a classic ambiguous figure popularized by psychologist Joseph Jastrow in 1899. The silhouette is bistable: it can be seen as a duck facing to the left (where the protrusions are its bill) or a rabbit facing to the right (where the same protrusions are its ears). The visual system cannot hold both interpretations in conscious awareness simultaneously, forcing a perceptual toggle. Jastrow used the illusion to demonstrate that perception is not a passive recording of sensory data, but an active, cognitive interpretation that is heavily influenced by mental focus, context, and semantic priming.