Stone Town's architecture has a number of distinctive features, as a result of Arab, Persian, Indian, European, and African traditions mixing together. The name "Stone Town" comes from the ubiquitous use of coral stone as the main construction material; this stone gives the town a characteristic, reddish warm colour. Traditional buildings have a "baraza", a long stone bench along the outside walls; this is used as an elevated sidewalk if heavy rains make the streets impracticable, or otherwise as benches to sit down, rest, socialize. Another key feature of most buildings is large verandas protected by carved wooden balustrades. The best-known feature of Zanzibari houses are the finely decorated wooden doors, with rich carvings and bas-reliefs, sometimes with big brass studs of Indian tradition. Two main types of doors can be distinguished: those of Indian style have rounded tops, while those in the Omani Arab style are rectangular. Carvings are often Islamic in content (for example, many consist of verses of the Qur'an), but other symbolism is occasionally used, e.g., Indian lotus flowers as emblems of prosperity.