Geeky, I know. Extremely!!
I was chatting to someone last night about light fields and it reminded me just how mind blowing they are. Essentially a light field camera captures 4D light information rather than 2D like a traditional camera - rather than recording a flat image it records the light levels in a volume allowing you to do all manor of clever things in post-production.
For anyone interested in exploring the frontier but is short for time check out this video,