Brewster is a screensaver for Windows 95/98/NT/ME/2000/XP, which simulates a kaleidoscope. It is an accurate simulation which produces mirrored images just like the real thing. The colourful symmetric patterns slowly change as the viewpoint rotates. Unlike a real kaleidoscope, however, the objects in the view can also be altered at the touch of a button, and the image can be stretched or distorted to fill the screen. Objects can be animated, or change colour in rainbow patterns.

You can design and save your own patterns, or just press the Randomise button for a unique new design at any time. Patterns range from gentle snowflake-like images to brain-burning psychedelic extravaganzas. Brewster can also play music or chimes.