Stack up the laser cut rings starting with the largest and working to the smallest. Align the rings so that they leave a symmetric border around the outside of the ring. You can put whichever side you like down depending on how you want the bowl to look. In general, I prefer to have the top of the laser cut rings stacked down so that the smokey side of the wood shows from the top of the bowl. You can stack one or both of the inner pieces of the ring as the base.