Sonic Vision by Douglas Moreman
Imagine two fish cavorting 50 feet below our boat. Our echoscopic "fish-finder" allows us to watch them via echoes of sonic clicks that have known and reliably detectable features.
The animation here illustrates two things:
The animation, from 2005, is composed of a series of individual pictures. Each was computed from simulated echoes of just one click - like a picture might be taken using a flash. But, our imaging system does not use an acoustic lens. It computes from times-of-arrival of echoes at a multitude of microphones. It uses "active" sonar - in which both the time and place of origin of a click are known.
This animation shows that two fish can be separated by the dolphin-inspired methods. An earlier animation shows more (and not all) that could be done, with the methods of 2004, in imaging a single fish. Both the 2004 and 2005 animations were made via active sonar, hence, very good range-information allowing computation of side-views.
The animation here came from simulation of "active sonar."