system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What is the purpose behind the common "crescent" shaped ice cube? 

Is it more effective in any way or is it no different from the traditional "cubes" from trays?
gpt
Crescent-shaped ice cubes are easy for a machine to remove from the tray. After they're done freezing, a mechanical arm swings in a circle and pushes them out of the tray. Cube-shaped trays are a bit harder to automatically remove the ice from them.