The Vajrasana Mandala - Amoghasiddhi (North). His skandha is that of volition - the will to act. He is the Buddha of total and spontaneous action: engaging wihout fear in compassionate action whenever he is aware of the need for help.
Tibetan Buddhist Thangka of a chorten (Skt. stupa), which translates as "the basis of offering." It's a symbol of enlightened mind and the path to its realization. The chorten represents the Buddha's body, speech and mind.