Like why does something being out of focus create weird circles
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Bokeh, lens flares, caused by focus of the shape of a lens, creates all kinds of effects, like star sparkles and rings, by capturing a smear of light over a filter in that shape.
A fisheye lens will usually produce circles and long curving streaks.
When you squint, you induce bokeh streaks caused by the shape of your eyelashes and if a wer tear is on your eye a diffent bokeh form arises and if a tear is on your eyelash and you squint, a whole different shape arises.
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