This is a photographic print made by briefly exposing photosensitive paper to the light from a laptop screen and then developing the paper. No camera needed.
The creator calls prints like these Laptopograms. Here’s the code for the “shutter”:
vbetool dpms on ; sleep 2.0; sudo vbetool dpms off
Ideas for further exploration: make prints of screen-specific subjects (desktop, web sites, email inbox, etc.) and hi-res wallet-sized prints using the iPhone.