Cooperative eye hypothesis Cooperative eye hypothesis The cooperative eye hypothesis is a proposed explanation for the appearance of the human eye. It suggests that the eye's distinctive visible characteristics evolved to make it easier for humans to follow another's gaze while communicating or while working together on tasks. Unlike other primates, human beings have eyes with a distinct colour contrast between the white sclera, the coloured iris, and the black pupil. This is due to a lack of pigment in the sclera. Other primates have pigmented sclerae that are brown or dark in colour. There is also a higher contrast between human skin,
Eye of the Serpent civilization. If the scenario is played as a one-on-one scenario, the player character is accompanied by three non-player characters. UK5 "Eye of the Serpent" was written by Graeme Morris, with art by Tim Sell and was published by TSR in 1984 as a 32-page booklet with an outer folder. It is part of the UK-series of modules, written by British authors and developed by TSR's UK division. Chris Hunter reviewed the module for "Imagine" magazine, giving it a mixed review. Hunter described the scenario as climbing down a "rather artificial looking" mountain side. This constitutes the main part of the