> Having been born in Königsberg in 1724, he never left the small German city, dying there in 1804 aged 79 never having once gone further than the city’s limits.

Totally false! Slander! He once went as far as the village of Jarnołtowo, a whole 60 miles from Königsberg![0]

But yeah. Maybe not one of history’s greatest travelers.

[0] https://en.wikipedia.org/wiki/Jarno%C5%82towo

Reminds me of Emilio Salgari (late 19th century, Italy's Jules Verne), one of my favorite authors growing up. He has many books on Malaysian pirates, Wild west cowboys (he's apparently considered the grandfather of the spaghetti western), adventures in India, etc. Always thought he must have been an adventurer, or at least a sailor. He never left Verona.

> We should note – without seeing it as physiologically symbolic of their respective philosophies – that Kant was constipated, while Nietzsche suffered from compulsive vomiting.

To the contrary, I'm pretty sure it is more than symbolic. Surely it matches their temperament (respectively) and thereby their philosophies.