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The size of the line is determined by the speed of the stroke. Faster is smaller, slower is larger. For an added bonus, there's a gray alpha channel drawn behind the stroke. It doesn't matter what you draw, it always looks angry. And no, I don't know what it is about me and robots, but I do like to draw them.

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As you draw in circles, the stroke is animated using a sin algorithm. Colors and size change on the time applied to the current stroke as well.

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This takes everything you draw and creates an ever expanding sine wave out of it.

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This takes whatever you draw and gives it a life of it's own. It reminds me of movement of thin hair. The color and width change depending on the length of the line, getting set when the mouse is released.