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The House of Wisdom Opens a Book — Baghdad, 820

A copying room in the House of Wisdom, the caliph's library complex in Baghdad, in the reign of al-Ma'mun

820 — a bright morning in Baghdad, the round city on the Tigris some fifty years built, the caliph's library gathering Greek, Persian and Indian books and a room of copyists at work turning them into Arabic

Numbers learning to solve themselves, in a room that smells of ink and wet reed. This breach reads the YOUNG COPYIST in the House of Wisdom: a working library where Greek and Persian and Indian books are being turned into Arabic page by page, sheets of paper stacked and weighted, the morning light coming in low across the desks. At one table a scholar writes out a method for restoring and balancing an equation — plain instructions anyone can follow, a procedure that will carry his name across a thousand years. The witness is read only at the desk and the looking-over: the fame is held entirely in the background, unmentioned, unmet. The fragment is the subject's own: the moment a hard thing came apart into steps they could actually do — and the memory beneath it of someone who once showed them how something worked, and the door that opened when they finally understood.

From the record

al-Ma'mun, caliph from 813, greatly expanded the library and translation work in Baghdad later known as the House of Wisdom, where Greek, Persian, Syriac and Indian works were rendered into Arabic
al-Khwarizmi worked there and composed a treatise on al-jabr and al-muqabala — restoring and balancing — setting out step-by-step procedures for solving equations in ordinary prose, with no symbols
the treatise gives worked examples and geometric demonstrations, and states its aim as serving practical needs in inheritance, lawsuits, trade, surveying and the digging of canals
he also wrote a work explaining the Indian decimal numerals and place value, including the use of a zero; its Latin transmission of his name gave Europe the word 'algorithm'
by the ninth century paper made from linen rag was being manufactured in Baghdad, replacing papyrus and parchment in the copying rooms
scribes wrote with the qalam, a reed pen cut and split at the nib, using a carbon-and-gum ink kept in a stoppered inkwell

The era door

a plain door of jointed cedar, the wood pale with handling, an iron ring for a handle and a strip of dust along its sill

BAGHDAD — 820

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