"Tomatoes" by A. Kitaoka If observers watch the star placed at the center, tomatoes appear to lose their freshness rapidly. In addition, black circles appear to get distorted to be angular; this phenomenon was proposed by Hiroyuki Ito in 2007.
Bridget Riley, op art artist
Victor Vasarely / Supernovae / 1959-61 / oil on canvas / this seems to move as you look at it, pretty amazing
op art hands