Whichever Wood you choose...
As with many natural products, wood can move as temperature and atmospheric conditions vary. You don't have to look far to see everyday examples, as these pictures show. Tap on the boat hull to enlarge it and check those gaps between the boards after its lengthy time in dry dock !
While we do take considerable care to ensure all our wood is fully seasoned and dried to minimise these effects, its important to realise that there can still be some natural settlement when siting wooden products in a new environment. This property is an inherent part of the nature of wood and often adds to a piece's individuality, character and beauty.