0 a flat shape with eight straight sides --
1 a flat shape with eight straight sides and eight angles --
The triangle is favoured because it offers a greater possible richness of association than other base-figures, such as square, hexagon, octagon, or decagon.
From the previous results, we can see that the sum of first two terms produces an octagon and last term a parallelogram.
Whether they were asked which octagon was brighter, which was darker, or which they liked more, participants tended to select the old one.
We consider an invariant subset generated by vertices of octagons.
The generation number of the two next largest octagons is zero.
It is generally assumed that the remaining six sides of the original octagon all contained tall round-headed niches of semicircular plan.
Each octagon is translated and rotated through the angle - /4 by the transformation.
The western face of the octagon is occupied by a tall round-headed arch belonging to the original structure.
