Here is a link to show how surrounding colors can affect the way you perceive colors, and helps justify the need for some sort of calibration.

http://www.echalk.co.uk/amusements/OpticalIllusions/colourPerception/colourPerception.html

-Chris
1 acre pond
Currently managing:
FHM, GSH, GSF, BG, PS, RES, LES, YP, SMB, LMB, HSB, RBT, WE, CC, FHC, and Grass Shrimp