Themes may be wide ranging. For instance, some may render the therapeutic encounter, others may depict emotions of physical or mental illness. Some may be interested in artistic renderings of anatomy, physiology, microbiology, medical equipment, historical medical documents, or medicinal herbs. Others may be interested in social or environmental roots of illness or social/spiritual rituals used in response to illness. Some may depict pieces from other art forms such as drama, music, or dance that have a medical theme.