This is pretty cool.

 

This is pretty cool.

 

https://www.youtube.com/watch?v=anHasqFguCM

Sorry this is fake.

 Trigger control grasshopper.

Sorry this is fake.

It would also be fake if it were actually a hologram. :-)

if it was a hologram of a fake whale cgi'd,

Would that make it triple fake?

 

Ah ha! I see what matroskin did there!

I was at a meeting where they briefly mentioned a company, Magic Leap which is doing this technology (its a startup).  For the real time effect this is viewed through glasses.  Kind of like a floating image with a transparent background / lenses.  In this video the audience did not see the whale "live", they were "in on the promotion video" where the whale was added afterwards.  With the glasses you would see it but if you were looking at the ceiling guess where the whale jumped out of.