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...[[sphere|spherical]] sacs one or two [[meter]]s in [[diameter]], the only visible feature within being a [[brain]] in the center of the sac, which in both si ...ere seems to be no measurable difference between the [[vision]] of the ool with and without eyes.

Humans are [[tetrapod]]s, with two arms and two legs. ...s and a strip over each eye, called an eyebrow. They have flattish faces, with slightly protruding noses but otherwise very little in the way of a snout;