Why do some of your pieces have cracks in them?
Similar to the human body, a tree has a high moisture content. When the tree dies its wood begins to dry, and as the water leaves the wood cells its mass is reduced. This shrinking causes cracking or "checking" in the wood. Once the humidity levels within the wood stabilize with that of the humidity level outside of it, the checking will cease.
Will the cracks in the wood get bigger?
As wood is an organic material, it's never truly "dead". As moisture levels rise and fall, the wood will react to it. Should you take your piece from a high humidity level environment and place it an incredibly dry one, the piece may loose more moisture. This in turn may cause further checking. Should you repeat the procedure in reverse, you may see the wood move back towards its original form. Each piece is treated with oils and polymers to help seal and stabilize the wood, but nothing short of a vaccum environment can guarantee a piece of wood not to "move".
What do you finish your pieces with?
All my bowls are treated with a food-safe Danish oil. As for my furniture pieces, I'm presently using a self-mixed Danish oil, but I'm beginning to experiment with other more eco-friendly solutions, and I'm considering adding a bees wax in to the mix.
Where do you find your wood?
My wood come from a variety of sources, Sometimes it's given to me by people who need to take down a beloved tree, but hate to see the wood to go waste. Other pieces are salvaged from a burn pile or wood chipper, or are beach combed.