Some people have no self-awareness, much less spatial awareness! You did respond to OP when you responded to me, and yes if you have been through a few successful interviews already you probably got the feel for how it all works already. If you have not had much success in 20 interviews, then this post is probably very helpful.

The post is somewhat directed to people with little or no experience. And a site interview is the best way to really catch a grasp of working knowledge vs. book knowledges.