system
Given the following post, respond as if you're commenting on Reddit:
human
How did Leibniz come to the conclusion that reality consists of single indivisible windowless monads?

I'd like to know how you can even reasonably conclude that with just reason.
gpt
Leibniz's issue, along with many others at the time, was the problem of having matter at the foundation of all substance. If we take a chair, we can divide it in half, and again, and again... Leibniz doesn't like this answer. He argues that there must be a single complete soul-like concept as a foundation of substance. This foundation can't be material because then it would just be divisible. 

So he posits these *monads*. Monads are necessarily immaterial. These monads are soul-like in that they are indivisible and thus suitable for the foundation of substance.