One question as a developer who often implements these sorts of interactions, is are there any examples of these actually in the wild? I do see a lot of extremely cool gifs of mockup interactions, but I'd be interested to see live, running implementations to show that the concepts are technically possible..

*And by technically possible, that really includes technical feasibility vs production budgets. I'm sure with enough time anything's close to possible, but often budgets dictate results unfortunately..

Most of these aren't even interactions..