anchor.diff:  to launch special-purpose visualization tools (including ones that you develop yourself).
   For instance: 
   
  -* **https://github.com/metasoarous/oz[oz]** is a Clojure library for displaying numerical charts;
  +* **https://github.com/metasoarous/oz[oz]** is a Clojure library for displaying numerical charts
   * **https://github.com/eggsyntax/datawalk[datawalk]** is a Clojure library for interactively exploring complex 
  -Clojure data structures.
  +Clojure data structures
   * **https://github.com/walmartlabs/system-viz[system-viz]** is a Clojure library for visualizing the components of a running 
  -Clojure system.
  +Clojure system
   
   [quote]
   ____
  
positive.code: ;; note: the same effect could be achieved using the 'inline-def' technique described in the previous section.
  
  ;;;; we can now directly evaluate any expression in the function body:
      (* r r) ; => 2.5E13    
      
            (>= r earth-radius) ; => false
            
            (Math/pow (/ r earth-radius) 3.0) ; => 0.48337835316173317
  ----
  
  This technique is described in more depth in Stuart Halloway's article
  
negative.code: You can usually customize how your REPL reads, evaluates and prints, but the method to do it 
  depends on your toolchain. For instance:
  
  * when using a REPL started from <<xref/../../../reference/repl_and_main#,clojure.main>> (as is the case when using the `clj` tool)
  you can customize the REPL by launching a 'sub-REPL': see https://clojure.github.io/clojure/clojure.main-api.html#clojure.main/repl[clojure.main/repl].
  * when using https://github.com/clojure/tools.nrepl[nREPL].footnote:[
  At the time of writing (March 2018), https://github.com/clojure/tools.nrepl[nREPL] is the most popular toolchain
  