The traditional focuses of Vietnamese culture are based on humanity (''nhân nghĩa'') and harmony (''hòa'') in which family and community values are highly regarded. Vietnam reveres a number of key cultural symbols, such as the Vietnamese dragon which is derived from crocodile and snake imagery; Vietnam's national father, Lạc Long Quân is depicted as a holy dragon. The ''lạc'' is a holy bird representing Vietnam's national mother Âu Cơ. Other prominent images that are also revered are the turtle, buffalo and horse. Many Vietnamese also believe in the supernatural and spiritualism where illness can be brought on by a curse or sorcery or caused by non-observance of a religious ethic. Traditional medical practitioners, amulets and other forms of spiritual protection and religious practices may be employed to treat the ill person. In the modern era, the cultural life of Vietnam has been deeply influenced by government-controlled media and cultural programs. For many decades, foreign cultural influences, especially those of Western origin, were shunned. But since the recent reformation, Vietnam has seen a greater exposure to neighbouring Southeast Asian, East Asian as well to Western culture and media.