"Ono uses a 'magic coin' analogy to illustrate the complexity of Ramanujan's vision. Imagine that Jacobi, who discovered the original modular forms, and Ramanujan are contemporaries and go shopping together. They each spend a coin in the same shop. Each of their coins goes on a different journey, traveling through different hands, shops and cities.
'For months, the paths of the two coins look chaotic, like they aren't doing anything in unison,' Ono says. But eventually Ramanujan's coin starts mocking, or trailing, Jacobi's coin. After a year, the two coins end up very near one another: In the same town, in the same shop, in the same cash register, about four inches apart."
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