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
Electronic components and diffuse white LEDs are placed on
two handmade PCBs, but the process of building light shields
between segments was the nightmare for me - different shapes,
with differently curved lines and differently cut, placed and
soldered, so that light never "leaks" to the adjacent segments.
Long live the right angle!
The clock is based on PIC18F2525 and has Li-ion battery backup.