Life←{
   r←¯1(⌽⎉1)¯1⌽(2+≢𝕩)↑𝕩
   s←∨´ (1∾<r) ∧ 3‿4 = <+´⥊ ¯1‿0‿1 (⌽⎉1)⌜ ¯1‿0‿1 ⌽⌜ <r
   1(↓⎉1) ¯1(↓⎉1) 1↓ ¯1↓s
}

blinker←>⟨0‿0‿0,1‿1‿1,0‿0‿0⟩
(<".#") ⊏¨˜  Life⍟(↕3) blinker