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In 1983 Hewitt D. Crane and Thomas P. Piantanida made interesting tests on the perception of so-called impossible colors.

The described phenomenon is known as reddish-green or yellow-blue, where test persons saw colors, they could not describe and which are outside the physical color space according to color theory. (By the way, Wikipedia has details on this).

These effects, caused by manipulation of the visual cortex, are quite individual in their expression, and thus set up differently from the subject of Aaron Bell tweeting as @aaronbell.

Aaron – in contrast to impossible colotrs – has been excited by the idea of expanding the limited color palette of a C64 by using rapid alternation between two colors to create a third, that is not part of the official palette.

The idea is as old as possible - but definitely interesting in its implementation. And since eye-candy for the breadbin is still a big topic today, the interested mind will find plenty of fodder for the brain in Aaron's article.