Pre-pre-block

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Pre-pre-block is a common predecessor to the pre-block (and thus the block).

x = 2, y = 3, rule = B3/S23 2o$bo$o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 Z 24 HEIGHT 320 GPS 1 AUTOSTART PAUSE 2 T 2 PAUSE 2 LOOP 3 ]]
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RLE: here Plaintext: here

This is easily created by a two-glider collision. Hitting the pre-pre-block with a glider can create a MWSS, as shown below. The gliders from the northwest and southwest create the pre-pre-block.

x = 22, y = 18, rule = B3/S23 $obo$b2o$bo11$4bo$4b2o13b3o$3bobo13bo$20bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 Z 20 HEIGHT 480 GPS 10 AUTOSTART PAUSE 2 T 23 PAUSE 2 LOOP 60 ]]
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RLE: here Plaintext: here

If the glider from the southeast can interact with the forming pre-pre-block one generation earlier, the result is an LWSS instead of an MWSS. However, this requires a different recipe, such as a glider colliding with a blinker. Notice the different orientation of the pre-block in the MWSS synthesis below. In the LWSS synthesis, the glider from the southeast is actually striking a "pre-pre-pre-block" stage of the glider/blinker collision.

x = 23, y = 20, rule = 23/3 10bo$10bo$10bo5$b2o17b2o$obo16b2o$2bo18bo$10bo$10bo$10bo5$b2o17b2o$obo 17bobo$2bo17bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 Z 20 HEIGHT 480 GPS 10 AUTOSTART PAUSE 2 T 24 PAUSE 2 T 25 PAUSE 2 LOOP 60 ]]
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RLE: here Plaintext: here

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