### 4.3 Classes

While the object system is general enough to describe all standardized classes (including, for example, number, hash-table, and symbol), Figure 4–7 contains a list of classes that are especially relevant to understanding the object system.

      built-in-class    method-combination         standard-object
      class             standard-class             structure-class
      generic-function  standard-generic-function  structure-object
      method            standard-method

                    Figure 4–7: Object System Classes