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Blue flower, red thorns, blue flower, red thorns - this would be so much easier if I wasn't color blind!
— Donkey ‧ Shrek

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker repeats the distinguishing colours of a flower and its thorns, then admits being colour blind. The difficulty is built into the instructions: the very feature needed for recognition is hard to use. The repeated description gives way to an exasperated explanation of the problem.
Context reviewed