EOS 5D Mark II; EF8-15mm f/4L Fish Eye USM; 15mm; f/8; 1/100 sec; ISO-1250 (Rhytm)
Angle determines the composition, and composition determines the harmony of a photo. Harmony is a balanced unification from an object that we shoot using the desirable angle.
A balanced composition does not always mean a symmetric one. Something that is symmetrical must be balanced, although balance is not always symmetric. Being symmetrical is a matter of proportional distribution of visual weight.