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This is actually a paraphrase of Dali's painting "Persistence of Memory" (1931), which some critics have argued that was inspired by Einstein's special theory of relativity, but they were denied when Dali said that it was inspired by Camembert cheese melting in the sun. This digital clock, however, is not made of cheese but FR4, which is normally used for PCBs. The digit segments on the front plate were etched by ferichloride, so the material remained transparent. Elec...