Here's a great video that shows the intensive research and development that goes into creating an iconic VFX shot
Anyone outside of the creative industries probably doesn't understand the amount of work that goes into creating visual effects. But even if you work in the business, you may be surprised at some of the research and development that goes into making a single, iconic shot.
Here's a detailed explanation about the "Mirror Man" sequence in "Snow White and The Huntsman, by the ever-ingenious team at The Mill.