Question: could we make projector phones if we find the secret to light and illusions?

Duncan McNicholl answered on 8 Nov 2017:

That depends on how much of the phone you want to be projected: if it’s projecting the display onto the wall, I think we could make something like that now, but the battery life would be rubbish. If it’s projecting the display up to make a 3D hologram thing, I think we’d need to do a lot of research before we could manage anything like that, and probably the battery life would be rubbish. If it’s projecting the entire phone, body and all, there’d be nowhere to put the battery, so the battery life would be rubbish. Any of those would be cooler than my old iPhone 5S, though, and the battery life on that is pretty rubbish too, so maybe you should go into science or technology and design a projector phone.