Very cool shot indeed. But there are two plausible explanations why the glass of beer is not perfectly vertical. 1) the table was not perfectly leveled and the photographer, so incredibly brilliant, shot the scene perfectly horizontal to specifically show off his talent and capture the exact degree to which the table was unbalanced.... or.... 2) The photographer was a little tipsy from drinking the beer on the table and could not shoot straight. But, in either case..... the perspective, the dof, the concentration are incredible. Oy. Michael.
