p72 quasi-shuttle

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p72 quasi-shuttle
x = 37, y = 23, rule = B3/S23 30bo$29b2o$28bob2o$b4o22b3o2bo$o4bo23bobobo$o3bobo23bobobo$bo3bobo6b2o 15bo2b3o$7bo5bobo16b2obo$7bo5bo19b2o$4bo2bo5b3o17bo$5b2o2$5b2o$4bo2bo 5b3o17bo$7bo5bo19b2o$7bo5bobo16b2obo$bo3bobo6b2o15bo2b3o$o3bobo23bobob o$o4bo23bobobo$b4o22b3o2bo$28bob2o$29b2o$30bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ THUMBSIZE 2 Z 12 GPS 6 LOOP 72 ]]
Pattern type Oscillator
Number of cells 84
Bounding box 37 × 23
Period 72
Mod 72
Heat 80.6
Volatility 0.96
Strict volatility 0.59
Discovered by Jason Summers
Year of discovery 2005

p72 quasi-shuttle is a period-72 oscillator found by Jason Summers on August 19, 2005.[1]

A twin bees shuttle variant, it consists of two B-heptominoes being hassled by two figure eights and two unices. In 18 generations the B-heptominoes are flipped into a centuries and a pair of blocks by unices, which then reacts with the blocks and figure eights to be flipped back into B-heptominoes in 61 generations, but with extra blocks. The extra blocks move the B-heptominoes forward without leaving extra centuries. Although this looks at first sight like a shuttle, it isn't really, because the active object does not appear flipped at any point. Like a regular twin bees shuttle, it can reflect gliders with the duoplet spark.

There is a 96-cell dimer with static symmetry D4_+2 that is notably statorless, and has the same cost in glider synthesis.


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

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