enh‿img ← ('#'⊸=∘⊑ ⋈ >∘('#'⊸= 2⊸↓)) •Flines"day20"
Step ← { enh ⊏˜ ((2⊸×+⊣)´∘⌽∘⥊)⎉2 3‿3 ↕ (2|𝕨 × ⊑enh) ⍉∘⌽∘(∾˘)⍟8 𝕩 }

•Show +´⥊ img Step´ ⌽↕2
•Show +´⥊ img Step´ ⌽↕50