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x = 38, y = 21, rule = B3/S23 2bo4bo22bo4bo$2ob4ob2o18b2ob4ob2o$2bo4bo22bo4bo2$15b2o$15bob2o$18bo$16b 3o6$16b3o$18bo$15bob2o$15b2o2$2bo4bo22bo4bo$2ob4ob2o18b2ob4ob2o$2bo4b o22bo4bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 10 ZOOM 10 LOOP 90 ]]
Pattern type Oscillator
Oscillator type Shuttle
Number of cells 66
Bounding box 44×27
Period 90
Mod 45
Heat 121.51
Volatility 1.00
Strict volatility 0.42
Discovered by David Eppstein
Year of discovery 1998

Diuresis is a period-90 oscillator consisting of two bookends being hassled by oscillators or stable catalysts. The original oscillator was found by David Eppstein on October 11, 1998,[1] and was hassled by pentadecathlons. With a minimum population of 66 cells, this is still the smallest known form of the oscillator in terms of cell count. Later that same day, Dean Hickerson replaced the pentadecathlons with the still life arrangement. The form below shows two still life arrangements, one with the minimal population (left) and one with the minimal bounding box (right).

The name is due to Bill Gosper, who compared the bookends to kidneys.

Without any sparkers or catalysts, the bookends still appear 45 generations later as they do in the actual oscillator, but with boats as junk.

x = 29, y = 25, rule = B3/S23 5b2o16b2o$6bo16bo$6bobo12bobo$7b2o12b2o2$4b2o18b2o$4bobo10b2o4bobo$5bo 10bobo5bo$2bo13b2o9bo$2b6o8bo5b6o$7bo14bo$4b2o18b2o$4bo20bo$5bo18bo$2b 3o2bo14bo2b3o$2bo2b3o8bo5b3o3bo$3bo12b2o7b3o$4b2o10bobo5bo$6bo10b2o4bo 2b2o$4b2o18b2obo$bo2bo20bo$obobo2b2o12b2o2bo$bo2bobobo12bobob2o$4bobo 16bo2bo$5b2o16b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBNAIL THUMBSIZE 2 WIDTH 600 HEIGHT 600 ZOOM 16 AUTOSTART LOOP 90 ]]
Diuresis supported by stable catalysts
(click above to open LifeViewer)
RLE: here Plaintext: here


  1. Jason Summers' jslife pattern collection. Retrieved on March 14, 2020.

External links