TELEIDOSCOPE There is no endpiece containing color, only a clear lens that turns everything it is pointed toward into a kaleidoscopic image. Brewster referred to the teleidoscope as the purest form of a kaleidoscope, because the viewer is not limited by the objects in an endpiece. Rather, the whole world becomes his kaleidoscope. It's been said that the ultimate value of the teleidoscope is the potential each viewer has to see the artistic value in his own environment.

Most teleidoscopes contain a simple equilateral three-mirror arrangement. However, every mirror system used in a standard kaleidoscope can also be used in a teleidoscope. Corki Weeks has probably experimented with more different mirror systems in a teleidoscope than anyone else, even placing two different arrangements in the same instrument; she also made one teleidoscope into a necklace. Jack Lazarowski and Tim Grannis of Prism Design created the ultimate limited-edition teleidoscope. "The Gallery" is a sculptural assemblage of five separate scopes, each with a different optical image, and removable from a lighted base.

CELLSCOPE The endpiece is an enclosed case containing colored objects (also called object case or chamber). Cells can be: dry-filled with tumbling pieces (front or side-lit); liquid-filled with floating pieces (front or side-lit); polarized light material and filters; empty to allow personal choice of items; tubes-elongated clear case with floating items in liquid.

There are more cell scopes than any other type. The many moving pieces provide the most varied and nonrepetitive imagery. There is also more variety in the cell itself. clear, frosted, or etched; recessed, flush, or protruding; black backdrop, side-lit; and liquid-filled. Increasingly popular are the cells that can be opened to include favorite objects. Bob McWilliam makes all of his cells with this added feature. One was used for a marriage proposal, with the inclusion of an engagement ring and the words, "Will you marry me?"

The space tube (or wand) is probably the most duplicated scope in the world. WildeWood Creative Products (in collaboration with Cozy Baker) was the first to produce this type of scope as the "Illusion" in 1990, and the "Grand Illusion" in 1998. Since then almost everyone who has ever tried making a scope of any kind has used some sort of liquid-filled tube with sparkling bits and pieces as the object. No matter which mirror system is used, the image resembles flashing fireworks. David Sugich developed a technique that transforms the wand scope into a three-dimensional wonderland of flowers, butterflies, or angels.

WHEELSCOPE One, two, or more wheels comprise the endpiece. Wheels can be: fixed or hollow cylinders; carousels or turntables. Wheel scopes have become much more exciting with the inclusion of more pieces of different kinds and shapes of glass arranged in a variety of patterns. Allen Crandell uses over 50 different pieces of glass in the primary wheel of his scope and more than 150 pieces of different shapes in the second wheel. The image is breathtaking! Janice and Ray Chesnik fuse their own millefiore patterned pieces for some of their wheels, and use all dichroic glass in others for a gloriously brilliant display.

Spinning cylinders are a variation of traditional wheels. Some contain a small liquid-filled cylinder within a larger cylinder composed of glass, crystals, and other objects.

As the name implies, a carousel or turntable is a continuously revolving or rotating conveyor or stand on which items are placed. It can be either permanently attached to the scope or a separate piece; as simple as a tray, or as ornate as a gem-encrusted gazebo.

MARBLESCOPE Single or multiple marbles are used as objects. The first marble scopes were made by attaching a small marble to a simple three-mirror system. Since the imagery was repetitious, this type soon declined in popularity. But marble scopes are new again, with several of the artists making their own marbles and using many different mirror systems. Knowing just the right combination of elements to include in these hand-blown spheres can provide extraordinary viewing. The addition of a second, third, and even fourth marble (as in the "Marbleator") increases the intricacy of the image. David Rosenfeldt recently came up with a liquid-filled marble, appropriately called "H-2-Orb."