Mostly section 6.15, especially 6.15.2.
6.15.2 A three-dimensional cube structure should not be reproduced in tactile graphic form as shown in print.
Now that I look at the section again (after having looked up the definition of "orthographic" from another source), I think that this section might not actually apply here - even though 6.15.2 seems to be talking about the source of my original question.
Does section 6.15 refer to three-dimensional cube structures such as those shown above, or is this section referring to situations where print uses orthographic maps? That would certainly explain why I'm so confused!