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I never meant to take this long to put the next page up. Sometimes I just... struggle with finding the right thing to talk about next, and the right way to say it, and a new pose for Bubbles, and... gah! Just—sorry!
That said, I always try to put a little curve in the legs whenever they're in a casual position. It helps the eye see which way the leg (and thus the body) is facing.
"Visual ambiguity" refers to when the brain doesn't get enough information to tell how it should interpret something. A good example would be an optical illusion like this:
Adding that leg curvature helps avoid this confusion. The brain sees what we want it to, without having to focus on resolving any ambiguity, letting it soak in the drawing as a whole.
Not all visual ambiguity is bad, though; some companies put in a lot of effort to make their text/graphics logos look like two things at once.
Next I'll talk about the arms—they do much the same thing, but the rounder side indicates the elbow/wrist.