In the beginning
(oh, long before that…),
When light was deciding
Who should be in and who should be out of the spectrum,
Yellow was in trouble.

Even then, seems that green
(you know how green can be)
Did not want yellow in
(some silly primal envy, i suppose).
But, for whatever cause, the effect was bad on yellow,
And caused yellow to weep yellow tears for several eternals
(before there were years).

…until blue heard what was up
Between green and yellow
And took green aside for a serious talk
In which blue pointed out
That, if yellow and blue were to get together
- not that they would, but if they did (a gentle threat) -
They could make their own green.

"oh…", said green, with some understanding.
Naturally, by a sudden change of hue,
Green saw the light and yellow got in.

It worked out fine:
Yellow got lemons, and green got limes.