Can you see energy?

The Open Culture Blog highlighted an interesting video with a post titled "Is anything real?" which led me to the producers' own Vimeo site, Stargate Studios where I found this fantastic video:

This video is made with a Weisscam HS-2 High Speed Camera which allows our slow human eyes to see things in a new way. What's going on in these pictures? Why have I listed this under "energy"?