The aether is total, but impalpable; it is invisible, but eternal; and finally it carries the light.

Ancient philosophers believed that the aether was the fifth element, absolute and divine. Chemical transformations take place due to it, and also the sky is such as it is. Because of its nature aether eludes direct observation and it is difficult to identify or measure it. A lot of people in the Middle Ages who have studied natural philosophy sought to identify and liberate aether or quintessence. They left only intricate texts and questionable evidence, so we don’t know exactly what they knew. But just one thing - aether is everywhere, in every grain of matter, in every photograph.

— Fedor Shklyaruk