The Baroque, Sinister, and Reciprocal Diagonal Lines
In the image below, the red line is called the Baroque diagonal. It runs from the lower left-hand corner of the rectangle to the upper right-hand corner. The green line is the Sinister diagonal. It runs from the lower right-hand corner of the rectangle to the upper left-hand corner. The four yellow lines are the reciprocal diagonals. They intersect the Baroque and Sinister diagonals at exactly 90 degrees.
By using the Baroque, Sinister, and reciprocal diagonals, the Dynamic Symmetry grid can grow infinitely, allowing for increasingly powerful designs. Also, by intersecting the main diagonal lines at 90 degrees with the rectangle’s reciprocal diagonal lines, many smaller versions of the main rectangle appear. These guidelines, in turn, help create theme, variation, and harmony in the final image.
Painting above by Anna Rose Bain emphasizing the Baroque diagonal
Painting above by Anna Rose Bain emphasizing the Sinister diagonal
The painting above by Caravaggio is designed using the Sinister diagonal line (yellow) and the reciprocal (green) of the root 2 Dynamic Symmetry rectangle. Notice how Caravaggio repeats these diagonal lines throughout the design.
Drawing above by Peter Paul Rubens designed on the Baroque diagonal.
Drawing above by Peter Paul Rubens emphasizing the Sinister diagonal.