1. A method of implementing a user interface on a computing device, said method comprising: providing a display area for displaying a plurality of thumbnail images representing a plurality of images stored on the computing device by arranging the plurality of thumbnail images in a set of rows; and providing a single user movable two-dimensional shape having a surface area, said two-dimensional shape moveable in two directions to allow a user of said user interface to concurrently adjust sizes of the plurality of thumbnail images displayed in said display area, wherein a movement of said user movable shape in a first direction causes the sizes of the plurality of thumbnail images displayed in said display area to decrease, and a movement of said user movable shape in a second direction causes the sizes of the plurality of thumbnail images displayed in said display area to increase, wherein when said user movable shape moves in one of the two directions to decrease or increase the sizes of the plurality of thumbnail images, the number of thumbnail images that appear on a particular row changes based on a width of the display area, a size of each thumbnail image on the particular row, a minimum spacing to be placed between adjacent thumbnail images on the particular row, and any extra spacing that is determined to be placed between the adjacent thumbnail images on the particular row.