Most people don't believe how dimensionally challenged I am. One of the many things I can't do, for example, is mentally rotate maps. If a map doesn't align properly I need to rotate it which can be akward if it is, for example, screwed to a wall. This has lead to odd scenes of me scribbling quick copies of maps on paper scraps so I can orient them in the direction I am facing.
So it's very good to hear that I'm not alone. David Weinberger too has dimensional challenges:
When I take a shirt out of a drawer, I can't predict which half will be on my left, although I do pride myself on rarely going wrong about which will be the outside.
I can't make that claim ;-)