On the other hand, vertical surfaces and motifs, carefully proportioned and integrated, add visual interest, which is another way to balance a design. Marshall chose tall, rectangular windows (portholes, deadlights, call them what you will) to light the forward staterooms on the main deck. Their size and shape reduce our perception of mass in the forward sections of the topsides. Farther aft, smaller windows of the same shape light the accommodations and break up an otherwise boring surface. The spaces belowdecks determine the location of these windows, but their harmonious grouping elevates function to an artistic level. The grouping on the port side differs from that on the starboard side, because the galley has two windows abaft the trio of the master stateroom instead of the one you see here.