This is just wow...

[Shadow Skill]

https://www.animenewsnetwork.com/interest/2018-05-23/innovative-designer-brings-magic-weapons-closer-to-reality/.131901

She must be a genius IRL.

[Buffalobiian]

That does look pretty cool. At first glance I thought they were real projections somehow, but then it becomes more 'real' once you see that it's projected along those spinning blade and not in air.

I checked out her channel a little after that, and I quite like the watch idea.

[Kraco]

Quite interesting indeed. It looked good. It's not practical for a real toy for various reasons, but as a curiosity it was cool and also as a demonstration of technology.