Something to consider, link. Excerpt:
The reality is that sensory perception can be nudged, distorted, and radically transformed by anything from the languages we speak to the surrounding visual context–something that is dramatically illustrated by the strength of perceptual illusions. Like a virus, a well-designed illusion contains just the right combination of features to essentially hijack the “machinery” of the perceptual system, including learned heuristics and innate functions, and make it do what it always does – interpret sensory input based on (usually) reliable cues. Unlike a virus, perceptual illusions are generally harmless, and can even provide a glimpse into the inner workings of our minds. They can also shed light on how our personal experiences, such as experiences with different languages, shape how we perceive the world around us.