Ok, after some weird related dreams here is

one last explanation.

There are more intersections of lines in the

drawing. Even more than I draw, however

most of them intersect with other circles

from the arch. So there is the small purple

circle, going through the eye of Guarino and

through the book. Call that C_0

This smallest circle touches the green, most

outer complete arc - circle from the arch.

That is also the exact point where most lines

come together.

The C_0 diameter, relates to all the other big

circles and provides us with ratios.

For example: Call the smallest most inner

big circle through the arch C_1, then dividing

diameters:

C_1/C_0 = 1.41 is the square root of 2.

This circle goes through the mouth of

another student, probably who loves

the square root of 2

Call the next circle C_2 and so on.

C_2/C_0 = 1.5. That is (1+square root 4)/2

C_3/C_0 = 1.62 That is (1+square root 5)/2 =

**the golden ratio**.

This circle goes through the mouth of both

Batista and Marcello symbolizing that this

is what they talk about constantly.

C_4/C_0 =1.73 That is (1+square root 6)/2

Then we have the blue circle, C_5. That is

exactly the circle where the roof parallel

extreme lines intersect.

C_5/C_0 = 1.82 That is (1+square root 7)/2.

Roofs symbolize shelter.

Divine number 7 interpretation.

C_6 is the green circle where most lines

intersect and also C_0 intersects in one

single focal point

C_6/C_0 = 1.91, if you know what it is

then tell me.

C_7/C_0 = 2 = (1+square root 9)/2

C_8 I drew, because it has the intersection

of two roof lines. C_8/C_0 = 2.05 Maybe = (1+square root 10)/2

All the circles of the arch, enclose the book

and the heads of Marcello and Battista,

symbolizing that that is what is going on

in their heads.