By Zach Abel
Answer: MOMENTOUS
The flavortext should read 'There is no "I" in this rainbow' because the I is missing from ROYGBIV in the title and Indigo is missing from the diagram. The symbols "••" form the morse code for "I," and the image contains only dashes and dots, hinting that the message is Morse code. Starting at the inner red dot in stacking order, the symbols and their colors are tabulated below:R O Y B V R Y G B V O Y B V O G B R O Y B V O G B R Y G B R O Y B V R . . . . . - - . . . - - . . - - - - - - - - . - . - - - - . . - . . .The colors resemble the cyclically repeating pattern ROYGBVROYGBVRO..., except that single colors are sometimes missing. Inserting these as blanks into the sequence produces this table:
R O Y G B V R O Y G B V R O Y G B V R O Y G B V R O Y G B V R O Y G B V R O Y G B V R O Y G B V R . . . . . - - . . . - - . . - - - - - - - - . - . - - - - . . - . . .These spaces provide the breaks between letters in Morse code, and this message spells "SUBMITMOMENTOUS," or, "Submit Momentous." The answer is MOMENTOUS.