system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: When you click two pens for example, why does it sound the same when you click them at the same time, but when you click them after one another it sounds like they are clicking at a different pitch?
gpt
It seems to me that in a pen click there are two parts to the sound- the initial click, and the release. So you end up with two parts to the sound. If the second part sounds different than the first part, the second pen click will sound different because you have the second part of the first click in your ear as you hear the first part of the second click.

Try clicking two pens without releasing the toggle.