The Z axis can be imagined to be infinitesimally narrow. There's no information in the stretching of the Z axis, so you can make that single color of data in th

The Z axis can be imagined to be infinitesimally narrow. There's no information in the stretching of the Z axis, so you can make that single color of data in the as visible as you like without adding any information. Our eyes see in two dimensions, so a Mar1d world with a Z axis one Plank length wide would still have the same colors, but it's impossible to see.