Translations by Samir Ribić

Draws quasiperiodic tilings; think of the implications on modern formica technology. In April 1997, Sir Roger Penrose, a British math professor who has worked with Stephen Hawking on such topics as relativity, black holes, and whether time has a beginning, filed a copyright-infringement lawsuit against the Kimberly-Clark Corporation, which Penrose said copied a pattern he created (a pattern demonstrating that "a nonrepeating pattern could exist in nature") for its Kleenex quilted toilet paper. Penrose said he doesn't like litigation but, "When it comes to the population of Great Britain being invited by a multinational to wipe their bottoms on what appears to be the work of a Knight of the Realm, then a last stand must be taken." As reported by News of the Weird #491, 4-Jul-1997. http://en.wikipedia.org/wiki/Penrose_tiling http://en.wikipedia.org/wiki/Tessellation Written by Timo Korvola; 1997.

Draws a simulation of an old terminal, with large pixels and long-sustain phosphor. This program is also a fully-functional VT100 emulator! Run it as an application instead of as a screen saver and you can use it as a terminal. Written by Jamie Zawinski; 1999.

0 deg

90 deg

Simulate instant film

Clip images

Draw drop shadows

Short

Long

Displays the 75 uniform polyhedra and their duals, plus 5 prisms and antiprisms, and some information about each. http://en.wikipedia.org/wiki/Uniform_polyhedra http://en.wikipedia.org/wiki/Stellation http://en.wikipedia.org/wiki/Dual_polyhedron http://en.wikipedia.org/wiki/Antiprism Written by Dr. Zvi Har'El and Jamie Zawinski; 2004.

Displays different 3D solids and some information about each. A new solid is chosen every few seconds. There are 75 uniform polyhedra, plus 5 infinite sets of prisms and antiprisms; including their duals brings the total to 160. http://en.wikipedia.org/wiki/Uniform_polyhedra http://en.wikipedia.org/wiki/Stellation Written by Dr. Zvi Har'El and Jamie Zawinski; 2004.

Truncated icosidodecahedron

This shows one of the six regular 4D polytopes rotating in 4D. Inspired by H.S.M Coxeter's book "Regular Polytopes", 3rd Edition, Dover Publications, Inc., 1973, and Thomas Banchoff's book "Beyond the Third Dimension: Geometry, Computer Graphics, and Higher Dimensions", Scientific American Library, 1990. http://en.wikipedia.org/wiki/Hypercube http://en.wikipedia.org/wiki/Tesseract http://en.wikipedia.org/wiki/Regular_polytope Written by Carsten Steger; 2003.

A quasicrystal is a structure that is ordered but aperiodic. Two-dimensional quasicrystals can be generated by adding a set of planes where x is the sine of y. Different complex aperiodic plane tilings are produced depending on the period, position, and rotation of the component planes, and whether the rotation of the planes is evenly distributed around the circle (the "symmetry" option, above) or random. See also the "RD-Bomb", "CWaves" and "Penrose" screen savers. http://en.wikipedia.org/wiki/Quasicrystal Written by Jamie Zawinski; 2013.

Animates the Rubik's Mirror Blocks puzzle. See also the "Rubik", "Cube21", and "GLSnake" screen savers. http://en.wikipedia.org/wiki/Combination_puzzles#Irregular_cuboids Written by Vasek Potocek; 2009.

This draws a sonar screen that pings (get it?) the hosts on your local network, and plots their distance (response time) from you. The three rings represent ping times of approximately 2.5, 70 and 2,000 milliseconds respectively. Alternately, it can run a simulation that doesn't involve hosts. http://en.wikipedia.org/wiki/Ping#History Written by Jamie Zawinski and Stephen Martin; 1998.

This draws a sonar screen that pings (get it?) the hosts on your local network, and plots their distance (response time) from you. The three rings represent ping times of approximately 2.5, 70 and 2,000 milliseconds respectively. Alternately, it can run a simulation that doesn't involve hosts. (If pinging doesn't work on Linux, you may need to make the executable be setuid.) http://en.wikipedia.org/wiki/Ping#History Written by Jamie Zawinski and Stephen Martin; 1998.

Undulating, throbbing, star-like patterns pulsate, rotate, and turn inside out. Another display mode uses these shapes to lay down a field of colors, which are then cycled. The motion is very organic. Written by Jamie Zawinski; 1997.

Number of points

1k

100k

TronBit

Draws an animation of the character "Bit" from the film, "Tron". The "yes" state is a tetrahedron; the "no" state is the second stellation of an icosahedron; and the idle state oscillates between a small triambic icosahedron and the compound of an icosahedron and a dodecahedron. http://en.wikipedia.org/wiki/List_of_Tron_characters#Bit http://en.wikipedia.org/wiki/Uniform_polyhedra http://en.wikipedia.org/wiki/Stellation Written by Jamie Zawinski; 2011.

PSR B1919+21 (AKA CP 1919) was the first pulsar ever discovered: a spinning neutron star emitting a periodic lighthouse-like beacon. An illustration of the signal received from it was published in Scientific American in 1971, and later in The Cambridge Encyclopedia of Astronomy in 1977, where it was seen by Stephen Morris, the drummer of Joy Division, and was consequently appropriated by Peter Saville for the cover of the band's album "Unknown Pleasures". http://en.wikipedia.org/wiki/Pulsar http://en.wikipedia.org/wiki/PSR_B1919%2B21 http://en.wikipedia.org/wiki/Unknown_Pleasures http://en.wikipedia.org/wiki/Peter_Saville_%28graphic_designer%29 http://en.wikipedia.org/wiki/Joy_Division Written by Jamie Zawinski; 2013.

Draws a randomly-colored Voronoi tessellation, and periodically zooms in and adds new points. The existing points also wander around. There are a set of control points on the plane, each at the center of a colored cell. Every pixel within that cell is closer to that cell's control point than to any other control point. That is what determines the cell's shapes. http://en.wikipedia.org/wiki/Voronoi_diagram http://en.wikipedia.org/wiki/Tessellation Written by Jamie Zawinski; 2007.

This is what the Internet looks like. This creates collages out of random images from the World Wide Web. It finds the images by feeding random words into various search engines, and pulling images (or sections of images) out of the pages returned. WARNING: THE INTERNET SOMETIMES CONTAINS PORNOGRAPHY. The Internet being what it is, absolutely anything might show up in the collage including -- quite possibly -- pornography, or even nudity. Please act accordingly. See also http://www.jwz.org/webcollage/ Written by Jamie Zawinski; 1999.

a detailed simulation of an old TV set, including artifacts like snow, bloom, distortion, ghosting, and hash noise. It also simulates the TV warming up. It will cycle through 12 channels, some with images you give it, and some with color bars or nothing but static. Written by Trevor Blackwell; 2003.

Draws the "digital rain" effect, as seen on the computer monitors in "The Matrix". See also "GLMatrix" for a 3D rendering of the similar effect that appeared in the movie's title sequence. http://en.wikipedia.org/wiki/Matrix_digital_rain Written by Jamie Zawinski; 1999.