The occult philosopher Robert Fludd created this image in the 17th century. It is called Black Square and quite literally represents nothing. The medium is not known for certain, but it is guessed to be an engraving.

From the Public Domain Review:

Black square ("and so on to infinity…" inscribed in Latin around its edges) representing the nothingness that was prior to the universe, as pictured by the great occult philosopher Robert Fludd, who himself passed into infinity on this day in 1637.

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