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My apologies for being slow on the uptake, but is there an analogy here or is this just a simple pun?

(t)he (r)eally (u)nusual (l)ights ... (y)ellows (a)nd (d)arks ... (u)ncommon (m)oods ... (b)rown (p)ackages (o)f (s)traw, (t)oo.

You missed it, but no harm done - it was not very interesting to begin with.