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A wooden column is used to support fixed blocks/planks that are suspended in the air.
Wooden columns can be used to support wooden blocks, but most of the time they are used to support Beams. They can be built up as high as you want, but remember that a bricktron can only build 2 up, so you will need stairs to build 3 up or higher. In the picture to the right, a wooden column is being used to support a Beam. This Beam is being supported by a Brace.