Adobe Systems has Adobe Photoshop part of it.
The tau effect is a spatial perceptual illusion that arises when observers judge the distance between consecutive stimuli in a stimulus sequence .. illusion. illusion. stimuli. Stimulus ( psychology ). When the distance from one stimulus to the next is constant , and the time elapsed from one stimulus to the next is also constant , subjects tend to judge the distances , correctly , as equal .. However , if the distance from one stimulus to the next is constant , but the time elapsed from one stimulus to the next is not constant , then subjects tend to misperceive the interval that has the shorter temporal interval as also having a shorter spatial interval .. Thus , the tau effect reveals that stimulus timing affects the perception of stimulus spacing .. Time is also a perceived quantity and subject to its own illusions ; research indicates that in the tau effect , perceived stimulus spacing follows perceived -LRB- phenomenal -RRB- time rather than actual -LRB- physical -RRB- time .