I have not got the time for boxes and sticky tape at the moment, and used my initative
The PC screen is simply being used in a similar way as lightboxes are used in film photography or Xray; For viewing a picture with light behind it. I simply used it as part of the scene to capture the additional light on camera.
Used as a lightbox, the PC screen broadens the abilities for various different effects. Quite a few folk who use texture files in software packages are likely using scanned in image files created via a scanner, rather than ones made by a conventional digital camera with lenses.