November 23, 2011

The remarkable nature of color vision leads to some interesting and puzzling phenomena.

  • The petals of a red rose are much brighter than its leaves by day, but the leaves are brighter at twilight!
  • After your eyes have adapted, you might see objects at night. But they appear to have no color. 
  • You notice a dim star in your peripheral vision, but when you look directly at it, it disappears!
  • After a long time of dark adaptation, you can see large objects, but not fine detail.
  • If you are examining a detailed object with reds, greens and intense blue details, the blue will be less distinct.
  • Ship captains and airline pilots can see outside better at night if their instrument panels are red.
  • White light and a spectral color produce a color. But that perceived color can be made in many different ways.
  • Two light sources appear equally white. Yet a colored object may be distinctly different in color in their light.
  • Why is a candle flame yellow?
  • Why is the sky blue?
  • Why is the sunset red?
A guilty conscience needs to confess. A work of art is a confession.

---Albert Camus