It was during this time that he worked on a publication which would in fact be his only book. Descartes had written a paper on music in 1618 but it had never been published.
Ito ay habang panahon na ito na siya ay nagtrabaho sa isang lathala na kung saan ay sa katunayan ay lamang ng kanyang mga libro. Descartes had nakasulat sa isang papel sa musika sa 1618 ngunit ito ay hindi nai-publish na.