All woodturners have limitations. Those constraints can be equipment or our body. An attraction of this project is that it does not require a chain saw, heavy lifting, an extensive shop, deep hollowing tools, a truck, or a strong back. Only a lathe and a basic set of turning tools are required.
The idea is to glue up a vase blank rather than turning it from a solid block of wood. A glass tube insert allows you to use the vase with water. No need to hollow.
While the completed vase will be 8”, this technique permits scale up or down. Regardless of the size, no hollowing is required.