The febreze logo exemplifies a few of the Gestalt principles. The principle of similarity is shown in both color and shape. I think using all blue makes a clean, fresh experience, while the wavy curvature creates movement and imitates an airy breeze. This logo also uses the principle of continuation. The top of the F leads you towards the breeze and through the window. The Z also leads you across the page. Proximity is used as the two objects in the upper right are grouped together, which allows us to see the bigger picture of a breeze blowing through a window.