Inspite of the foregoing, and after noting that temples feature inter-relating squares and circles, John Michell depicts the image from Revelation 21 like this. If you need to review, you can go back and see that most temples feature double or overlapping squares. What I mean is, if this were a universal template for sacred geometry, it seems that Michel could have come up with a dozen or so examples to show that.
Michell writes of an ancient canon of proportion formed after a perfect model of the cosmos founded on 'principles of which we are now ignorant'. (He had apparently never read Bromwell.) Then he states that 'as symbols there is no difference between the Temple and the New Jerusalem', which is true. It is also true that the word triangle is not in the Bible, and the word circle occurs only once, and the entire descriptions are quadratic code. This form is not described in the Bible.
Mitchell has missed the quadratic nature of the biblical event, meaning that the place at the center is a square, which is surrounded by a circle. The inner most element is square symbolizing the earth, while the outer most is round symbolizing the sphere of the heavens. I believe that his inspiration was the Dome of the Rock mosque seen below, but his diagram is a triangulum, not a quadratic form like the mosque.
The Dome of the Rock
The drum of the dome housing the rock is suported by four pillars and 12 columns (3 in the east, north, west and south). The design expresses the geometric fusion of the 'celestial' sphere or circle with the 'earthly' crystal of the square and octagon (double square).
Four Groups of Three
The floor plan and the elevation plan require different geometric schemes. While the floor grid is derived from a square, the elevation grid derives from an equilateral traingle.