| “Black is real sensation, even if it is produced by entire absence of light. The sensation of black is distinctly different from the lack of all sensation.” - Hermann von Helmholtz
every page of Vortäge und Reden by Hermann von Helmholtz has been painted out with black ink, however, text can still be read by holding the book at the appropriate angle in a light source.
untitled (helmholtz in black)
untitled (helmholtz in black)
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