Clive Thompson · 12w Behold a seven-segment clock display ... ... that runs pneumatically it alternately sucks in and then releases the segments, so they appear as divots in a rubbery surface very organic! item #6 in ... May likes BC? @May likes BC? 1778467944 @nprofile1q... The logic behind thisv clock is incredible. I didn't know you can do that with pneumatics! 1