Spin has a couple of points here.
1) You really do only see light in three colour bands. 564-580nm, 534-545nm, 420-440nm.
Yellow light is 570-590nm and is detected by the interaction of your RED or LONG cones, minor stimulation of your GREEN or MEDIUM cones and the amount of light on your RODS.
Turquoise on the other hand just barely stimulates your GREEN medium and BLUE short CONES, (and a tiny amount of RED long) cones. So Turquoise is what your brain invents when it's getting a lot of light with a little blue and a little green in it.
But to answer the original question, Spin is either mad or a troll. I hope for his sake he's a troll.
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