From some locations you have several paths to choose from; for instance you can, from where you are right now, proceed into the bar or the museum. So you’ll see, when turning around 360 degrees, two hands. Or: as soon as you enter the museum, you can move to the rear of the room. But, to continue the tour, you have to go back and move into the small passage and then up the stairs. From there you’ll move into the Alien room, and so on.
Click on the Pictures on the right to enlarge.