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   Hi Alexander,   
      
   13.12.2024 11:56:02, Alexander Koryagin   
    wrote:   
      
    AK> He grinned at Harry's amazement. They stepped through the archway.   
    AK> Harry looked quickly over his shoulder and saw the archway shrink   
    AK> instantly back into solid wall.  --------------   
    AK> Why is "solid wall" without "a" article? It is a countable noun,   
    AK> isn't it?   
      
   I can tell that in this case it "kind of" isn't. It's "solid wall" as an   
   idea (or type) of vertical surface, not one separate wall, neither one   
   of four wall in a room or something, you know what I mean? I'd suggest   
   you have a peek at context.reverso.net and look around for examples and   
   ideas of how words or expressions are used in written English (I find   
   this site very handy).   
      
   In the following phrases we can see the same "absence" of articles:   
      
       Okay, things don't just disappear into thin air.   
       I prefer to stand on solid ground.   
      
      
   --    
   "A closed mouth gathers no foot."   
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