François d'Aguilon

François d'Aguilon (French pronunciation: [fʁɑ̃swa daɡilɔ̃]; also d'Aguillon or in Latin Franciscus Aguilonius) (4 January 1567 – 20 March 1617) was a Jesuit, mathematician, physicist, and architect from the Spanish Netherlands.

[3] The notable geometers educated at this school included Jean-Charles della Faille,[4] André Tacquet,[5] and Theodorus Moretus.

He taught logic, syntax, and theology while being charged with organizing the teaching of geometry and science which would be useful for geography, navigation, architecture and the military arts in Belgium.

[14] D'Aguilon extensively studied stereographic projection, which he wanted to use a means to aid architects, cosmographers, navigators and artists.

D'Aguilon expanded on the horopter by saying in his book: If objects fall upon different rays it can happen that things at different distances can be seen at equal angles.

[13] The horopter was then used by architect Girard Desargues, who in 1639 published a remarkable treatise on the conic sections, emphasizing the idea of projection.

It is evident, from the detail that he put into his drawings, how enthused Rubens was about the subject matter, perspective geometry and optical rules.