This element of design is Negative Space. The hand isn't actually holding anything. It implies that there is a light bulb in the empty space. Negative space guides your imagination to finish the image.
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The “Hockerbank” meaning stool-bench designed by Johanna Dehio was inspired by makeshift seating. This series consists of several stools that are supplemented by a plank with round cut outs and round tables which can also be transformed into a long table.