Collecting ceramics may be seen as traditional, even old-fashioned, but there is plenty of room for eccentricity. This puzzle mug by George E. Ohr is an unusual piece by an unconventional artist. There are holes in its sides; if you try to fill it and drink from it like an ordinary mug, the liquid spills out -- probably onto you. Puzzle mugs usually have a hollow portion, often in the handle, that…