In addition to being a very independent philosophical thinker, Spinoza was deeply interested in more practical study of nature, something that may have had to do with his day job as a lens grinder. He published two short texts on probability and optics of the rainbow (the latter following Descartes).
A philosopher interested in the real world: something that became quite a rarity in later times...
A philosopher interested in the real world: something that became quite a rarity in later times...