This Galileo lamp series is by Florence-based designer Edoardo Lietti. (As I find is often the case with designers these days, there’s virtually no information offered about the design or the thinking behind it.)
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“Adjust the shadow simply by rotating the ‘planet.'”
The two pivot points of the metal shade appear to ride within a groove inside the circle; it’s tough to see as there’s no detail shots.
I guess part of the appeal of the object is its DIY aesthetic, but I’d love to see further exploration and refinement.
Source: core77