The word rhythm is usually associated with music. What could it possibly have to do with designing a deck? The answer is that the method in which you express the repetition of elements in your deck will likewise affect how it is visually interpreted. Think about the vertical components of your deck from an elevation plan perspective. How are the structural posts, rail posts, and pickets aligned? The order and the variation of these parts will compose a coordinated pattern that will affect the appearance of the deck.

The IRC code prohibits guard rails from containing openings greater than 4". However you can use smaller openings or develop a pattern; perhaps using 3 pickets grouped together with 2" spacing followed by a 4" void between groups (I I I I I I I I I I I I). The use of this type of expression will seem fresh and stand out as a unique and thoughtful detail rarely found in most deck designs. You may consider using a decorative baluster to center in a section of rail as an accent; this can provide a visual anchor to balance the rhythm. Structural and rail posts are usually applied uniformly as a means of support but can also function as a decorative element to express balance.