"you can't rotate in 1D"
oh yeah? then explain this 1D rotation matrix
@dpwiz @acegikmo I should probably add that it really is a rotation matrix: it’s orthogonal (its transpose is its inverse) and orientation-preserving (its determinant is the empty product, which is 1). Just like any rotation it’s a composition of rotations in planes in 0D space, namely of 0 rotations. (Can you tell what my favorite number is? :) )
@dpwiz @acegikmo Here, have a 0×0 rotation matrix: ()