This simple-to-build lamp uses a flexible LED strip with both back and front firing surface mount LED's to create rich interactions with both paper and the surface the lamp is placed on.
The back firing yellow LED's are diffused by the paper. Light from the rear firing red LED's is scattered and illuminates the water mark thru the paper. Direct and scattered light interacts at the edges of the cylinder.
A gap in the plastic tape holding the tube together create a slit of light projected behind the lamp.
I am still trying to figure out how to photograph it properly. Camera automation is confused by the monochromatic light sources and the dynamic range required to capture the various light sources
manually is beyond most digital cameras.