Wow the card reading experiment is really amazing! Also I'm not sure if this is similar or not but the following, seems like it might be related: https://www.

Wow the card reading experiment is really amazing! Also I'm not sure if this is similar or not but the following, seems like it might be related: https://www.cl.cam.ac.uk/~mgk25/ieee02-optical.pdf https://www.cl.cam.ac.uk/~mgk25/ieee02-optical.pdf "Optical Time-Domain Eavesdropping Risks of CRT Displays" Where he picks up an image from the diffuse light from a CRT on a wall.