In his later years, these seem to have included designing an elaborate spiral staircase, and an ingenious new form of pump, but the most important of Desargues' interests was Geometry.
Sa kanyang susunod na taon, ang mga mukhang may kasama pagdisenyo ng isang masalimuot likaw hagdanan, at isang napakagaling bagong form ng pump, ngunit ang pinaka-mahalaga ng Desargues' interes ay geometry.