Shield, circles on a cross, spirals, swirls

Pillar design, cross with three points on the tip

Siena Cathedral, Siena Italy, full side view

Floor detail at Siena Cathedral, the sacrifice of Isaac

Cross ceiling of Siena Cathedral

Geometrically derived cross and overlapping circles

Siena cathedral interior, six six-point solar discs

Four cardinal virtues, prudence, solar disc, snake

Floor design, wheel of fortune, solar disc, eight-point sun

Ceiling of Siena Cathedral, light in the middle of a cross