The upper, left stone is probably a Antique or Christian sarcophagus fragment. The motif symbolizes sound or colour waves. In Christian theology there are ideas about the rays of colour and precious stones. In Ancient Greece a symbol for Apollons lyre. The strings represent heavenly forces which sing in different tones. Together they create spherical harmony. The bottom stone is a Christian leaved cross with a strong Mesopotamian influence. South wall. Panagia Gorgoepikoos / Mikri Mittropoli, Athens, Greece.