⍝ Draw over '*'s:

    chars←4 4⍴'**··****·*·*·***'

    ⍕display¨chars(draw chars)
 ┌→───┐  ┌→───┐ 
 ↓**··│  ↓┌┐··│ 
 │****│  │└┼─┐│ 
 │·*·*│  │·│·││ 
 │·***│  │·└─┘│ 
 └────┘  └────┘ 

    ⍕display¨chars('·'draw chars)
 ┌→───┐  ┌→───┐ 
 ↓**··│  ↓**──│ 
 │****│  │****│ 
 │·*·*│  ││*·*│ 
 │·***│  ││***│ 
 └────┘  └────┘ 

⍝∇ draw display

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