Some are activated by colour or brightness but not at all by shape or movement.
ECONOMIST: The biology of art
The role of the magno cells is to signal contrasts in brightness, while the parvo cells react to both brightness and colour.
In addition, star colour is simulated for noticeably red, blue and yellow stars, along with the changing brightness of three variable stars Algol, Mira and Delta Cephei.
ECONOMIST: The joys of indoor star-gazing
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