I try to think of what things will be like in the future. And so I try to come up with the most impossible thing, and then explain it backwards. In the future, we will be able to see in old photographs other things not in the frame of the picture. All the information in the whole room will be available in the photons recorded in the picture plane. How? I don't know, photon interference and artificial intelligence, that's how.
And then I get headlines like this:
Deep learning enables real-time imaging around corners
Jan 2020, phys.org
Never far enough; it's already here.
This doesn't see invisible objects in old pictures, but it does shoot lasers in real-time and then read the interference patterns of those lasers on themselves as they bounce off of other objects not "visible."
image source: Hyperspace Bypass Construction Zone
Notes:
Deep-Inverse Correlography: Towards Real-Time High-Resolution Non-Line-of-Sight Imaging.
Chris Metzler et al. Optica (2019). DOI: 10.1364/OPTICA.374026
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