The Romanian Orthodox Church evolved from the Eastern Orthodox tradition of Christianity. It is based around Catholicism, and is one of the most visually ornate religions in the world. The architecture of the churches is imposing, with elaborate interiors, and makes great use of iconography. Services are almost entirely sung, and incense is used an an offering to God. The priests' vestments all have symbolic meaning and differ according to rank; traditionally, they did not cut their hair or shave their beards, though this has changed somewhat over the past century.