Hi, Pharo4 #155 now contains a Pointer explorer build with the Eye Tree Inspector framework: EyePointerExplorer openOn: #zot EyePointerExplorer openStrongOn: #zot Why is this needed? ————————— Currently we still use a sub lass of ObjectExplorer for the PointerExplorer, which means that we can remove the whole package Tool-Explorer now that we have one based on the new inspector. Next step? —————— - put the new tool as the default (and unify Smalltalk tools strongPointerExplorer with pointerExplorer) - remove package Tool-Explorer (ca. 700 Loc, 6 classes) Class comment: ============= A variant on the TreeInspector that works "backwards". By default it shows both weak and strong references (#openOn:) but I can be configured to omit weak refs with #openStrongOn: Like the TreeInspector, it shows a tree of objects, but expanding a node won't show the objects which that node references, but rather the objects that reference that node. Its main use is to track down memory leaks: if you want to know why a particular object is still alive, open a PointerExplorer on it and drill down until you find the root object that's referencing it. For example, find all the references to the symbol #zot with: EyePointerExplorer openOn: #zot For the "name" of the object, the PointerExplorer shows each object's identityHash, to allow the user to identify when two similar objects are identical and notice cycles.