The main difference is in the shape of the head - there are three main shapes.

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Machines then weave and sew them into fibre mats several layers thick, which can be moulded into three-dimensional shapes.

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Behind a tinted glass panel 18-carat gold powder, laid down by a robot arm, sparkles as a laser fuses the metal into complex three-dimensional shapes, layer by layer.

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Three-dimensional printers, which gradually layer materials to form shapes, are widely used in manufacturing.

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Flag formations can take many shapes, but the most simple can be broken into three components, as illustrated on the daily chart.

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