Applying slow motion

[Spartacus Maximus]

Has anyone else experimented with slow motion? Most martial arts that have forms do them with at least some speed.

Tai Chi is probably the only exception, or at least the most iconic slow-motion(compared to almost every other) martial art. 

Does anyone else often practise their martial art’s forms in slow-motion like Tai Chi? What have you learned or discovered by doing that?