christian rüger and farid zitoun: “who arrives here returns home to himself”
the empty circle symbolizes fire: it is one of the oldest signs of mankind. the circular symbol as a simplified illustration of the sun.
the circle with a bar symbolizes water: the horizontal line represents the water level.
the circle with the filled square symbolizes air: the square in the middle is suspended in free space and is held in position by the invisible air.
the circle with the central cross symbolizes earth: the cross in its center points to all four points of the compass. it illustrates that the world as a whole is more than the sum of its parts.