John Martinaeu - The Dance of Venus (An accurate scientific drawing of Venus stunning pattern around the Earth. Our closest planetary neighbour draws a huge pentagram pattern around Earth every 8 years or 13 Venusian years. Four of the eight-year Venus cycles are shown, with the motion of Venus around Earth over 32 years), “A Little Book of Coincidence”, 2002.
Classification diagram for igneous rocks. Igneous rocks are classified according to the relative abundances of different minerals. A given rock is represented by a vertical line in the diagram. In the ultramafic field, the arrows represent a rock containing 40% olivine and 60% pyroxene. The name an igneous rock gets depends not only on composition, but on whether it is intrusive or extrusive