Following in yesterday’s track, here is Tetrad, which relates to 2-D volume.

©Kathleen O’Brien, The Mystery of Numbers, Tetrad, 12 x 7.5″
Tetrad is a Golden Rectangle.
 
 
©Kathleen O’Brien, The Mystery of Numbers, Tetrad, detail, square

A square is formed within the vesica piscis when two lines are drawn between the two midpoints of the circles and the intersections of the vesica piscis. Taking this square away, the next Golden Rectangle remains;

©Kathleen O’Brien, The Mystery of Numbers, Tetrad, detail, Golden Rectangle

©Kathleen O’Brien, The Mystery of Numbers, Tetrad, detail, square

“Four is the first number formed by the addition and multiplication of equals (4=2+2 and 4=2×2). The square represents justice”* and the earth. Taking this square away, the next Golden Rectangle remains;

©Kathleen O’Brien, The Mystery of Numbers, Tetrad, detail, Golden Rectangle

The ephemera is of Hellebore, and the four botanicals are Lilacs. What are your associations about four?

*Words in Quotes are from Divine Proportion by Priya Hemenway

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