The Disk of Ouroboros pictures a snake eating it's own tail, representing the eternal cycle of death and rebirth, and the nature of eternity. It can be found in Alessa's sickroom in SH1.

https://media.kbin.social/media/de/13/de136b26395511ad679776defa1b6d16480ddb33618635fe866b88ddf9bd7166.png

The post directly above this is a gif a snake biting it’s own tail when trying to catch a mouse.
Same