Corrugated cardboard has the interesting property of being partially transparent in one particular direction: that of the corrugations. When you construct something with stacked slices of corrugated cardboard, you can see through it if you look at it the right way. When I was slicing topographical maps, it occurred to me to try to slice it in a direction other than horizontal. You lose the contours, but the roughness of the surface I thought might look interesting if back-lit. It ends up looking quite dynamic when you walk past it:
To make this lamp, you will need access to a laser cutter, some corrugated cardboard, a $75 LED panel, and some 2×4 lumber.
LED panels meant for ceiling tiles are inexpensive and provide light over a 4 square foot area. That size is easy enough to laser cut pieces for and will preserve lots of detail. It does make for rather a lot of cardboard, though: 132 pieces consuming 8 sheets of 2'×3' cardboard. Choosing a design that is REALLY topographically interesting (e.g. a mountain) may consume too much cardboard (and cause you to stand in front of the laser cutter for rather more time than you intended). I chose part of the Grand Canyon; a place I've never been to but have always been fascinated by.