 It is often depicted in an interlaced form with the lines of the hexagram passing over and under one another to form a knot.It is a specific instance of the far more general shape discussed in Blaise Pascal's 1639 "Hexagrammum Mysticum Theorem".In Aleister Crowley's Thelema, the hexagram is usually depicted with a five-petalled flower in the centre which symbolises a pentacle.