The time difference between the uploads is usually between 1 and 20 minutes, and never more than one hour. Most are 11 seconds long, although they can be 1 minute,[4] 5 minutes, or 25 minutes.[5] All are slideshows. The 11 second videos have 9 slides. Each slide is about 1 second long, has a solid white background, and contains two solid color opaque rectangles, one red and the other blue. Both rectangles have a random size, shape, and position in the slide. When the two overlap, the red rectangle always appears over the blue one, and on rare occasions, the red rectangle completely covers up the blue one. Each slide has a random computer-generated wave tone. In the corner of each video it says "aqua.flv - slide (number with four digits)". Early videos were called "aqua",[6] then were changed to "tmp" followed by random characters.