User:Aadenboy/ɻ

ɻ (pronounced /ɻə/) is a CA.

Tiles on the grid define the locations where a pointer can be. # is a generic place. o is the start for a single pointer. Pointers step forward every step and only turn left or right when blocked from moving forward, based on the direction it had turned previously. If the pointer hasn't yet turned left or right before, or has such information removed via a four-way intersection, it will be removed.

### >>> ### <<<
#   ^     #   ^
o   o     o   o

##### ##>>> ##### <<<## ##### ##X##
  #     ^     #     ^     #     ^
  ##o   ^<o o##   o>^     o     o

##### ##X## ##### ##X## ##### ##X##
  #     ^     #     ^     #     ^
##### ##^## ##### ##^## ##### ##^##
  #     ^     #     ^     #     ^
o##   o>^     ##o   ^<o   o     o

Such layout flips a pointer's existing chirality:

# #
###
 #
 o

And can be used to make an oscillator:

#########
# #   # #
# ##### #
#   #   #
#####   #
    #####
o####