Colorado Springs, 1899. I built a magnifying transmitter capable of generating millions of volts and photographed myself reading in the laboratory while artificial lightning twenty metres long crackled above my head. The photograph required a double exposure. I was not actually in the room during the discharge — the current would have killed me.
But the...

— Dickenson V. Alley, photograph of Tesla in Colorado Springs laboratory (1899); Nikola Tesla, 'The Problem of Increasing Human Energy,' Century Magazine (June 1900).
19th–20th Century