Interesting. I just did an experiment. I took a straight piece of wood and a curved piece of wood and placed them both on a table. the straight price of wood was in contact with the table at all points. the curved piece of wood was in contact with the table on both ends of the piece, but not in the middle. In order to get the front part of the curved piece of wood to contact the table I had to move the rear portion off the table and lower.
