This is a terrific story with a terrific twist!
Though I fail to see how you've worked in the required constraint... About how your character only sees two colors? Maybe it was reeeeeal subtle and 424 only sees purple and white, the colors of the orchids?
Hmmm. Debatable. :p
Nevertheless, splendid story - I very much enjoyed reading it! :D
You got me. I didn't even think about that component... but I thought it was optional. shrugs My bad.