The Nazca Lines "Needle and Thread" drawing begins at the left of the figure as a wide beam; the beam is focused to a line as it moves right the "needle"; the Nazca people then use an oscillatory motion to delineate the borders of a plateau; and ends up drawing a spiral, a common motif at ancient sites.
Continue reading at:
gogeometry.com/incas/nazca_lines_needle_1.htm.
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