common-lisp:standard-object, common-lisp:t

blocks-world:load-bearing-block, blocks-world:movable-block

The superclass of all objects in the Blocks World (not including the hand). Subclasses of the blocks-world:basic-block class characterize different kinds of objects, and have different properties.

They all have a name, given as the name slot and in the examples from the book, a global variable of that name is used to refer to them. Since this chapter is an explanation of CLOS, no specific constructor function is defined, and users may call make-instance directly.