Comment by tananaev
1 day ago
I think the box explanation is misleading. There isn't literally a box whose surface you measure. The idea is that the state of a higher-dimensional gravitational system can, in some cases, be completely described by a theory in one fewer dimension.
Is the "in some cases" constraint really necessary? I thought Bousso's whole point in his talk linked elsewhere in this thread is that you can describe a 3D system in terms of 2D information.
Could you keep going, fully describing systems of higher order in less and less dimensions?
So like describing the properties of a sphere by using a circle.
Not a circle but the surface of the sphere
For black holes it is quite literal tho.