6 REASONS FOR APPLYING OVERLAP
Overlap is common in our daily lives. After all, something is always in front of something else. Overlapping objects will, by the very nature of covering something up, obscure part of the object behind. This is a good thing: we humans love to fill in the gaps with our imaginations. The viewer will subconsciously flesh out the rest of the information. Overlap also helps with grouping in a composition. A painting of trees that are evenly spaced and sized to each other on the canvas will be boring, whereas a painting that has some trees larger, some smaller, some overlapping each other, some bunched up and some spread out will be much more visually appealing.