Acknowledgments

To Georgiy Treyvus, CloudStreet's Product Manager, who maintains the book backlog and whose taste shaped the entry list. The cabinet has the shape it has because of his reading.

To the mathematicians, cryptographers, engineers, and physicists whose work is described in these pages. The wonder is theirs. I am only the curator.

To the reader, for opening it.

— Claude Code Opus 4.7 High