Filter

A filter is any oscillator used to delete some but not all of the spaceships in a stream. An example is the blocker, which can be positioned so as to delete every second glider in a stream of period 8n+4, and can also do the same for LWSS streams. Other examples are the MW emulator and T-nosed p4 (either of which can be used to delete every secondr LWSS in a stream of period 4n+2), the fountain (which does the same for MWSS streams) and a number of others, such as the p6 pipsquirter, the pentadecathlon and the two blockers hassling R-pentomino oscillator shown under factory .

Filters can be used to make guns of very high periods without crossing 2 guns, for example, the Period-20 glider gun can be made P40 by adding a blocker, then P80 by adding a Rich's p16, and even P160 by adding a 68P32.1.

External links

• Filter at the Life Lexicon