3.6.4 Vars. Clojure also has a global variable system: vars. These references are interned in namespaces and are the storage locations to which free symbolic references in code are resolved and
bound. Vars are created and interned via def and its various flavors. Vars can be dynamically
rebound on an opt-in basis. The primary purpose of the var system is for references to functions,
and their variable nature is what supports dynamic development.

#object[java.awt.Color 0x798ea70f "java.awt.Color[r=0,g=255,b=120]"]

0x798ea70f

610:   /**
 611:    * Returns a string representation of this object. Subclasses may return
 612:    * any desired format, except for null, but this implementation returns
 613:    * <code>getClass().getName() + "[r=" + getRed() + ",g=" + getGreen()
 614:    * + ",b=" + getBlue() + ']'</code>.
 615:    *
 616:    * @return a string representation of this object
 617:    */
 618:   public String toString()
 619:   {
 620:     return getClass().getName() + "[r=" + ((value & RED_MASK) >> 16)
 621:       + ",g=" + ((value & GREEN_MASK) >> 😍 + ",b=" + (value & BLUE_MASK)
 622:       + ']';
 623:   }