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A square is a shape and a shape cannot be invented.
The cube shape occurs naturally in nature (eg a crystal of Galena is cubic) thus the shape was not invented by anybody.
The United Kingdom Post Office issued the 1d black on 1st May 1840. It was the first adhesive postage stamp and was invented by Rowland Hill.
Yes a polygon is considered a 3D shape or also 1D or 2D would be a polygon.Taylor Fairington 16