This rare phenomenon is called "Baikal Zen", where rocks lying on the surface of frozen lakes are heated by sunlight that emits infrared rays, melting the ice below. When the sun sets, the ice freezes again, creating these incredible frozen near-impossible structures.
If you want more relatively positive stuff on your twitter timeline, give me a follow (or don’t but it’s the season of giving so yeah) https://twitter.com/thegallowboob/status/1312935113768996865
You should also go follow @ok_girlfriend for good stories like this one: https://twitter.com/ok_girlfriend/status/1330628664308936707