23 JAN 2026

Day 23

He who by reviewing the old can gain knowledge of the new is fit to be a teacher.

Confucius · The Analects

A long sheet of papyrus covered in columns of hieratic script, written in black ink with section headings in red, showing mathematical problems and their worked solutions.

I · THE OBJECT · BRITISH MUSEUM

The Rhind Mathematical Papyrus

Second Intermediate Period Egypt · c. 1550 BC · Papyrus

A scribe named Ahmes copied out eighty-four worked problems in 1550 BC, from an older text he could no longer fully understand. His errors show us where his knowledge ended.

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II · THE IDEA · ARTIFICIAL INTELLIGENCE

The Recurrent Era and Its Bottleneck

Language and tokens · RNN, LSTM · Pre-attention era

Before attention, models read sentences the way you might read while walking: one word, then the next, carrying a summary forward in working memory that grew blurry with distance.

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A vast barrel-vaulted ceiling covered in frescoes, divided by painted architectural elements into rectangular panels, triangular spandrels, and lunettes, populated by hundreds of figures including prophets, sibyls, and scenes from Genesis.

III · THE WORK · ART HISTORY

Michelangelo's Sistine Chapel Ceiling

Michelangelo · 1508–1512 · Fresco

Four years on a scaffold he built himself, painting standing up. Nine scenes from Genesis held together by an architecture that exists only in paint, and two fingers that almost touch.

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