Geometry issue. There’s no third axis in which to form and arrangement. At least that’s the way I took it.
It’s like when we say cartoons or TV are two dimensional. They technically have thickness as everything in reality has thickness.
Wow, you're messing with my mind. Far out, man! Everything I see is photons reflecting off objects and hitting my retina - two-dimensional. Things technically have thickness but my eyeballs see two-dimensional. Your TV analogy is awesome. On the serious side, something approaching zero in thickness can generally be considered as having zero thickness.