KEY STONE
"The twelve divisions of the circle symbolize the twelve spiritual intelligences of the universe.
The center of the circle symbolizes the supernal mind.
The circle or ideal form materialized becomes the square. (Materialized spirit.)
The keystone symbolizes man in the square or on material plane. (The plan anthromorphized.)Man, through the experience of earth life (the cross) becomes perfect. Hence man is at once the key to, and the result of the plan. Having come through the circle to matter, man becomes the square of the circle.
The Sphinx symbolizes the perfect man, hence faces the east (light), the rising sun; he is through with its setting (darkness or earth life.)
He looks to the center of the circle (the sun)--the heart, in a sense, where dwells love eternal and life immortal--the peace and silence that naught can disturb.
All phenomena are based on exact proportion; there is no chance or accident anywhere to be found. All is harmony, under mathematical rule, hence nothing can be altered.
Man, the highest phenomenon, stands on the same mathematical platform of the Great World Plan with the tiniest creature that exists. There is no preference anywhere in the plan! All is progressing slowly but surely, from the simple to the complex, up the same ladder, rung after rung, measured and weighed by the same wise and unchanging laws that give each and all the highest justice."
Flip the Sphinx upside down and we can see the keystone shape. Think Mirror.
Just flip Ole Georgie Washington upside down and there is the Keystone shape too.
Look at our stunningly gorgeous First Lady Melania Trump directing our attention to the Sphinx.
Q has a recurring crumb, 5:5 so this might mean something.
"The pyramid form as a whole is an exemplification of the number ten; its four triangular sides and the base side on which it stands, making five sides, and the four base corners with the chief corner, or ideal apex, making five corners; corners and sides together making ten."
PLAYING CARDS (Alice's Queen of Hearts and Court)
...."As Gypsie mean Egyptian, this mysterious nomadic people, originally from the desert, may have brought the cards from the Orient.
Total divisions of the year symbolized in the cards. Days, weeks, months, seasons and lunar circuits.
365.24-(total face value of the cards)symbolizes the days in a solar year.
52-number of playing cards, symbolizes the number of weeks in a year.
12-number of picture cards, symbolizes the number of months in a year.
13-number of cards in each suit, symbolizes the 13 lunar circuits in a year.
4-number of suits, symbolizes the 4 seasons in a year...." 
HEADDRESS
"...well known to geometricians, the pole of a pyramid stands fixed, and the base being moved about describes a cone; hence it is apparent that the conical shaped headdresses are simply another expression of the pyramid form."
Maltese Cross
"The Maltese cross is the simplest and most clearly indicated of all pyramid symbols. The four triangles, placed in the four cardinal directions of space, plainly represent the four triangular sides of the pyramid, the common centre where the triangles meet indicating the apex."
Swastika
....it suggests the revolution of the pyramid on its axis, its crampons indicating motion; and when revolved or twirled, it displays the plane of the circle, or the base of the cone, thus geometrically relating it to the pyramid."
It also pretty well symbolizes the solstice and equinox movements around the Pole star.
The book mentions symbolism of Dice, Belted Globe and Patriarchal Cross and of course the square and compass. It is truly fascinating. Still reading it myself.
Link to it here
http://magnetic1176.rssing.com/chan-53592626/all_p1.html