I don't know if anyone has used ripples in a liquid, but LCD's without polarizers are used in tomography to dynamically configure a diffraction or phase-shift p

I don't know if anyone has used ripples in a liquid, but LCD's without polarizers are used in tomography to dynamically configure a diffraction or phase-shift pattern. https://en.m.wikipedia.org/wiki/Spatial_light_modulator https://en.m.wikipedia.org/wiki/Spatial_light_modulator