Prayer flags are coloured panels of cloth, printed with prayers and mantras, which are thought to be carried heavenward by the wind. Horizontal prayer flags (Lung Ta) are square shaped coloured panels of cloth connected along their top edges to a long string or thread. They are commonly hung on a diagonal line from high to low between two objects in high places such as the tops of temples, monasteries, stupas or mountain passes. From high to low the colours are blue (symbolizing sky/space), white (symbolizing wind/air), red (symbolizing fire), green (symbolizing water), and yellow (symbolizing earth). Vertical (darchor) prayer flags are usually large single rectangles attached to poles along their vertical edge, commonly planted in the ground or on rooftops.