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Natural wood, no matter how it was dried originally: air dried or kiln
dried, will adjust to the ambient humidity in the atmosphere around
it. Even through a finish. This moisture causes the cells
of the wood to expand and contract as it enters and leaves the wood, not
always equally. If one surface expands more then the other it
warps. In small pieces this movement is minuscule and, if joints
are properly done, will result in no appreciable change. But on
large flat surfaces like table tops, such movement can be
considerable. Proper design and construction can minimize this but
nothing can eliminate it all together unless you replace the solid wood
with a material that does not warp or curl, like plywood.
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