> From the airshaft robot animation there are two marks on the
> vertical wall .. upper left.
> See video at 3.52
> They indicate the position of the upper block .. (second door).
> Viewed from inside the small chamber.
> Are there any real photographs of these marks??
> They were obviously made before the upper block was placed and
> could not have been used/observed for placing.
> Therefore they can only have been used to pre-calculate the
> position of the upper block face relative to the door.
> Obviously this dimension was of great importance.
> Post Edited (20-Jun-15 00:35)
In the link that follows, scroll down to the section on "The Second Blocking Stone". There is a photo montage, a Dassault Systems interpretation of the montage, and a discussion of it. The red marks are in a darker region on the photos but if you magnify it you can see them there. They seem more complex/intricate than just the two simple lines depicted in the Dassault-generated graphic.
How can any of us ever know, when all we can do is think?