The 18th-century physicist who invented the paper size in your printer today

Ideas & Philosophy · Published 29 September 2026 Swipe more like this →

In short: Georg Christoph Lichtenberg was a German polymath whose influence spans from modern xerography to the A4 paper standard. Though he was a pioneering experimental physicist, he is best remembered for his private scrapbooks—a collection of biting wit and philosophical reflections that captivated thinkers from Goethe to Sigmund Freud.

Born in 1742, Lichtenberg became the first professor in Germany dedicated explicitly to experimental physics. He was a central figure in the Enlightenment, known for introducing apparatus into lectures and installing Benjamin Franklin’s lightning rods in his own home. His scientific rigor led to the discovery of tree-like electrical discharge patterns, now known as Lichtenberg figures, which are recognized today as early examples of fractals. His massive 2-meter electrophorus, used to generate static electricity, provided the basic principles that would eventually underpin modern xerography.

Beyond the laboratory, Lichtenberg was a prolific satirist and an astute observer of human nature. He kept notebooks he called Sudelbücher, or waste books, from 1765 until his death in 1799. These volumes, which contain aphorisms, autobiographical sketches, and sharp critiques of contemporary quackery, earned him posthumous fame as one of Western history's greatest aphorists. Figures like Arthur Schopenhauer, Friedrich Nietzsche, and Sigmund Freud admired his ability to think for his own instruction, while Goethe famously noted that where Lichtenberg made a joke, a problem lay hidden.

Lichtenberg’s legacy is surprisingly practical. He proposed a paper size system based on a square root of two aspect ratio, which serves as the foundation for the international A-series paper standards used globally today. Despite his intellectual stature and his election to the Royal Society in 1793, he remained a complex, often procrastinating figure who struggled with chronic health issues following a childhood spinal injury. He died in 1799 at age 56, leaving behind a body of work that continues to challenge and amuse readers who, as Leo Tolstoy once lamented, often neglect this brilliant mind.

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