system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why do washing machines have concave glass doors instead of flat glass doors?
gpt
Two reasons, assuming a front loading washing machine:

First, the concave glass window pushes inwards on the rubber water seal. This makes it so that clothes that hit it push the seal further into the glass rather than have the possibility with a flat window that the clothes peel the seal from the flat surface of the glass (causing a water leak).

Secondly, the concave glass helps push the clothes in the washer around as it's spinning to help agitate the clothes (clothes will bounce off it and be pushed further back). With a flat window, there's a possibility the clothes end up stuck spinning next to the window, never moving away from it. Because the clothes are not moving, they do not get a good wash!