Rubin's vase, or Rubin's face, depicts both, because the side profile of two identical faces matches the outline of a vase — sometimes a candlestick. Illusions like Rubin's vase are called ...

Optical illusions, such as the Necker Cube and Rubin's Vase, trick the brain into seeing one interpretation first and then another, as the image is studied. The human brain effectively switches ...

For example, one study found that people with higher IQs were more likely to correctly identify the hidden face in the Rubin vase illusion. Another study found that people with higher IQs were ...