Movie 6. Multiple pulses in a soft gel moving on a highly frictional substrate. The motion of a hydrogel filament on a thin elastic polydimethylsiloxane film subject to harmonic lateral vibrations is shown. (The substrate is always vibrated sinusoidally, except when otherwise mentioned.) The gel modulus is now 100 times smaller than for the earlier movies, whereas the frictional drag is 500 times greater and allows us to see multiple pulses that propagate along the gel. The scale angles are 30° from vertical. The wave signal is sinusoidal with a frequency of 62 Hz. Small particles are on the top surface of the gel to aid in visualization of the wave. The frame acquisition rate of the camera was 1,000 frames per second, and the motion of the vibrating substrate is subtracted out to aid the visualization.