Hollow cylindrical structures or containers, often used for transportation of fluids or as conduits.
From Latin 'tubus' meaning 'tube, pipe'. The word entered English in the 17th century, initially referring to musical instruments like trumpets before expanding to any hollow cylindrical object.
The London Underground is famously called 'the Tube' because of its circular tunnel design, but the nickname actually comes from the cylindrical shape of the original trains themselves! Tubes are everywhere in nature too - from plant stems to blood vessels, making this simple geometric form incredibly versatile.
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