How to achieve holographic controls?

In countless series of the world of science fiction we see something that we all accept as realistic but makes no sense. Holographic controls. We simply say that since it's the future that it makes sense. But the problem is that I see no way how this could work. If it was a classic hologram then our hands would simply block out the light, no input. If it was glass with button then there are no wires, no input.

How can I achieve (seemingly) holographic control boards using future technology?

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How to achieve holographic controls?

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