Human can see different colors because they have very complex image sensor in their eyes.
Colors are one of electromagnetic wave, which are exist in visible range (from 400 nm to 700 nm).
From this electromagnetic spectrum we can see the beauty in this world, (including what do you see now).
(For further reading, see : http://en.wikipedia.org/wiki/Color_spectrum)
For challenge in this week, i’d like to share some pictures in Taipei Lantern Festival, which was held in February 23rd 2013 to celebrated Chinese New Year. You can find giant lanterns in many colorful and unique forms 😀