Wood is what allows trees to stand up firm and grow large, so if it's not standing erect it's not true wood. Good wood can have some spring to it but is never flaccid. A particular type of imperfection in a piece of wood is a knot. knots in your wood will affect its durability and performance, but can be exploited for visual effect with expert polishing. Professions that work with wood are: carpenter, swamper, lumberjack, sculptor, and call-girl.