Something I've never understood about 2D/Flatland as a "visual" idea: In the case of this Mar1d, if I'm on the X-axis, and can only see the Y-axis, wouldn't any amount of detail in the Z-axis constitute a 3D image? The Y-axis stretched even a single "pixel" along Z would make it 3D, right? Similarly, for Flatlandia: If I'm a 2D square on the X-axis, and can see "around" me on the Z-axis, wouldn't my ability to see an…
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.