"It is an experiment in treating their colour-blindness, so they will stop biting when they can see the blood and realise they are hurting people," I explained.
"One red lens and one green one," Another Kiwi vouchsafed. "Like the psychiatrist character from Twin Peaks."
"We were relaxing in the Wigglesworth Lounge at the Old Entomologist when we thought of it," I said, "kicking around a few ideas for research projects..."
"-- Also a pickled spleen which makes a serviceable substitute for a hacky-sack," AK interrupted. It turned up in one of the carboys labelled "Gin" and "Rum" and "Akvavit" but otherwise indistinguishable, which we bought cheap as office supplies from the vile Throgmorton.
"...Why should Jay and Maureen Neitz get all the headlines and acclamation for their gene therapy for colour-blindness in spiders?" I continued.
"I think you will discover," said tigris, in tones of no-encouragement, "that the Neitzes work with spider monkeys."
recognising ripe fruit," AK conceded.
And now commentator ITTDGY alerts us to the fact that the spiders have cured themselves of colour-blindness by evolving their own little filters, in front of one spot of the retina, made of red oil droplets. Well done Evolution! See how much you can accomplish when you sober up?
no surprise to the Riddled readership that spidras have big telephoto paparazzi lenses for their main pair of eyes. At the back of the eyes they have boomerang-shaped retinas which scan back and forth across the focal plane like misplaced windscreen wipers sweeping up the photons, tilted this way or that to pick out linear features slanted at different angles. Scientists put so much time into the study of spider optics because they hope to discover better boomerang designs. Not many people know that.
Compound eyes #1: Dragonfly, Japan
Compound eyes #2fit their big spidrabrain into their cephalothorax body segment so it bulges into their legs.