Bitman light is an exercise in typophotography. The idea was to display textual messages through long expo photography. The process is described as follow:
Because bitmap fonts are constrained to a grid, it is relatively easy to isolate 1 pixel column.
Aligning these columns in a sequence yields in a simple animation like the one below. This simple animation can be (and I personally recommend to be saved as) an animated gif. Once produced, this gif can be published in any browser or loaded into a mobile phone or tablet.
Now, to recover the text, try sweeping your mobile phone camera in front of the gif using a long exposure app.