The function objc-object-from-pointer
returns the Lisp object object associated with the Objective-C foreign object referenced by pointer. For an Objective-C instance, object is of type standard-objc-object and for an Objective-C class it is the standard-class
that was defined by define-objc-class.
Note that for a given returned object, the value of the form
(objc-object-pointer object)
LispWorks Objective-C and Cocoa Interface User Guide and Reference Manual - 21 Mar 2017