David R, thank you very much.
hopeofdawn, thank you very much. I wouldn't say my opinion is expert, this is just what I gathered from tea lessons and reading
Fuyou wrote:... So, in short, it's up to the owner of the bowl, or the host of the tea ceremony.
Hallo Fuyou, it's interesting, but I have one doute, why it has to decide which is the face to the owner of the bowl, or the host of the tea ceremony. What function does this decision?. Greetings.
In a tea ceremony, the face of the bowl should be presented to the guest, and the guest should not drink from the face of the bowl. This is a sign of respect to the maker of the bowl, as well as to the guest and host (respectively). That is why it is important to determine which side is the face.