Graham,

I agree the 2/1 rectangle is a simple starting point. Here is a diagram I posted a couple of months ago showing the double square formed by the 2/1 slope of the ceiling of the entrance passage:



According to Petrie, The ceiling of the entrance passage intersects the outer casing of the pyramid 705.97 inches above ground level and the ceiling of the entrance passage ends 1142.8 inches below ground level.

705.97 x 1.618 = 1142.3

Ground level divides the ceiling of the entrance passage into a golden section, within 1/2 of one inch, over the entire 4133 inch sloping length of the ceiling of the passage. This is a margin of error of less than one in 8000.

It is hard for me to understand how anyone could believe that the external height/base phi ratio and the extension of the ascending passge phi ratio and the height of the KC phi ratio and the heignt of the passages phi ratio and the division of the entrance passage phi ratio, are all meaningless and/or irrelevant to the building of the great pyramid.