My linocut print of Zhang Heng in Han robe in blue ink on cream coloured washi paper with his seismoscope in bronze ink on the left and a cross-section schematic on the right in bronze ink with moving balls in red. Above in pale pink at chest level is a waveform of a horizontal surface wave (especially Rayleigh waves) is overprinted on top. The seismoscope is shown as knee-high urn, cylindrical with dome top with small sculpture birds on top. Midway up are a circle of dragon heads with balls in their mouth (4 are visible). At the base are 4 visible open-mouthed frogs. In the schematic you can see a pendulum moves and released a ball which goes in one of the radiating troughs abs hits a lever which released the tongue and ball in one dragon mouth which drops a ball (after Feng Rui et al, 2014)