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Great post!
A few years ago, I visited the Opel Technology Train (which traveled by rail across Europe) and stopped in every capital city. It was a really great exhibition. That’s where I first saw a hologram of an Opel engine.
I would have loved to visit that train, what a great idea. It's good that you had that opportunity. Holograms don't need oil. 😁
Yeah, it was a great experience. 3D hologram of the working engine, and you can put your hand inside :)
And without any glasses.