Blah, here's a screenshot from behind that may help you. http://i.imgur.com/2ADZ4fg.png The ones marked with red are normal stairs and the ones marked with blue are upside-down stairs. The other 4 all face towards the center.
Here's a screenshot from another angle. http://i.imgur.com/6sFOlH9.png As you can see, only one of the faces disappears. Not sure that's an intended feature.
Blah, here's a screenshot from behind that may help you. http://i.imgur.com/2ADZ4fg.png The ones marked with red are normal stairs and the ones marked with blue are upside-down stairs. The other 4 all face towards the center.
Here's a screenshot from another angle. http://i.imgur.com/6sFOlH9.png As you can see, only one of the faces disappears. Not sure that's an intended feature.