Pi calculator
π calculator  
View static image  
Pattern type  Miscellaneous  

Number of cells  1189325  
Bounding box  117573×155887  
Discovered by  Adam P. Goucher  
Year of discovery  2010  

The π calculator is a device constructed by Adam P. Goucher in February 2010, which calculates the decimal digits of π (the transcendental number, not the Life pattern!) and displays them in the Life universe as 8×10 dot matrix characters formed by arrangements of blocks along a diagonal stripe at the top. A push reaction moves a tenblock diagonal cursor to the next position as part of the "printing" operation for each new digit.
The actual calculation is done in binary, using a streaming spigot algorithm based on linear fractional transformations. The π calculator is made up of a 188state computer connected to a printing device via period8 regulators and a binarytodecimal conversion mechanism. The complete pattern can be found in Golly's Very Large Patterns online archive,^{[note 1]} along with the very similar 177state phi calculator which uses a simpler algorithm to calculate and print the Golden Ratio, φ.
Notes
 ↑ Accessible in Golly via Help › Online Archives › Very Large Patterns › Pi calculator.
External links
 Pi calculator at the Life Lexicon