Nice panel discussion that introduces the theories and some of the figure heads behind the theories of the holographic principle.
As holographic is referring to a abstract less dimensional information storage, Raphael Bousso figured out how much information theoretical can be stored in a surface to represent volume, using a black hole. Leonard Suesskind has some nice insights into the nature of relativity in conjunction with the event horizon. Also there the extrapolation that in reverse there is a outer event horizon formed by the expanding universe only showing us things where light actually can still outrun the ever accelerating and expanding distance. Also in the sense that a 3D universe is represented on the event horizon of an black hole while being absorbed there is a theory that postulates that our 3D universe actually represents the event horizon of an 4D universe (+one spacial axis) being crushed on the 3D “surface” of this one dimensional higher black hole (not discussed in this panel).