When looking at a grayscale banana photo, why does your brain see a hint of yellow?

When viewing grayscale images of familiar objects like yellow bananas or red strawberries, our brain automatically recruits 'canonical colors' from long-term memory. This cognitive bias actively projects the expected hue onto the actual gray surface. First described by physiologist Ewald Hering in 1878, it proves that subjective experience directly alters physical visual perception.