Visitors stand on one side of a frosted screen and view projections of magnified grains of dust, pollen, and other particles floating in convection currents created by the heat of a spotlight placed on the opposite side of the screen. The appearance and size of the particles change as they float in and out of focus. When the particles are in focus, they possess color, shape, and form.
Dust is everywhere in Tucson.
The dust in Limelight was gathered from air vents, floors, and other locations in the Center for Creative Photography. Seeing dust Investigate where dust is visible in the classroom. Explore depth of field , a concept that applies to both a camera and our human eyesight. Tell the students to hold their thumbs up about six inches from their eye. Tell them to focus on their thumb and notice that, while it is in focus, the rest of the room is out of focus.