A rosette
A detail of the decoration of the floor in the "Room of the Columns" at the Domus dell'Ortaglia in Brescia (II-III century): it is a rosette with a (rough) dihedral symmetry of type D8 (if we ignore the colouring of the inner circle).
© Musei Civici d'Arte, Storia e Scienze di Brescia, 2005
foto di Fotostudio Rapuzzi, Archivio Fotografico Musei
The image belongs to the sections...:
*8. (D8) (Symmetry)
Decorations of floors (Anthology of images)
Decorations of floors (Symmetry)
Domus Ortaglia (Brescia) (From the exhibitions of matematita)
Further information:
http://www.bresciamusei.com/