I was lucky to be selected to teach two rotations at the AAW symposium in Raleigh, NC in 2019. The topic selected was deep hollow vessels from the bottom-up. One of the best ways to create a hollow bottle shape that has a very same hole at the top and a big bulb at the bottom is to hollow it from the bottom, then disguise the entry hole by putting a plug in the bottom and then using three decorative rings.
Below are the pages from the demonstration handbook which explains the process.
Below are three of the items turned via the bottom-up technique that were sold in the silent auction.
