Michael Carnes who has been working on reverb hardware starting with the Lexicon PCM90 and all the subsequent units and plug-ins until he left Lexicon to set up Exponential Audio. As a result Michael knows a huge amount about reverb and in this video he expands and demonstrates all the basic principles of reverb including early reflections, diffusion and reverb to name but a few.
This is an excellent primer video for anyone who wants to understand exactly what all the controls to in a reverb plug-in or hardware unit do. Although he uses his Phoenixverb for the demonstrations what he covers can be applied to any reverb unit or plug-in.