music washes away the dust of everyday life

In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture and focal length of an optical system determine the cone angle of a bundle of rays that come to a focus in the image plane.

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another point of thinking

Praxis is the process by which a theory, lesson, or skill is enacted, embodied, or realized. “Praxis” may also refer to the act of engaging, applying, exercising, realizing, or practicing ideas

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