Trail4 steps
Hidden messages
Palindromes, ancient word squares, ciphers, and the mathematics that breaks them.
People have always hidden meaning in patterns, and other people have always tried to find it. This trail moves from ancient wordplay to modern cryptography.
- I
Start with a word square from Pompeii that reads the same in every direction.
No. 104ObjectHistoryThe Sator Square A five-word Latin puzzle scratched on a wall in Pompeii reads the same in four directions. Nobody agrees on what it means. - II
Symmetry in language turns out to have a counterpart in DNA.
No. 091ConceptLanguagePalindromes are written into your DNA “A man, a plan, a canal: Panama” has a molecular cousin: your genome is full of sequences that read the same in both directions. - III
From hiding patterns to hiding meaning: the oldest famous cipher.
No. 019ConceptHistoryJulius Caesar’s secret code (and why it failed) Caesar hid messages by shifting each letter three places. It worked until a 9th-century scholar invented a way to break any cipher like it. - IV
Modern codebreaking relies on probability, including one surprising coincidence.
No. 015ConceptMathematicsIn a room of 23 people, two probably share a birthday It sounds impossible with 365 days to choose from, but the odds pass 50% with just 23 people and reach 99.9% with 70.