A famous Swiss psychologist named Carl Jung, which is pronounced yoong. Explored the concept of the mandala in depth. A mandala is an image of form within form. Often it is shaped like a circle, but it can be any shape. Mandalas have concentric patterns that relate back to a center point. In ancient India, a form of mandala called the yantra was used by yogis as a tool for meditation. Jung used the mandala as a tool in psycho therapeutic practice. Many henna painters use mandalas in their work.