Is there a way to make multiple "boxes" point to the same heap of memory?

By definition, you won't .

Box

explicitly created with the assumption that it is the sole owner of the object inside.

If multiple owners are required, you can use Rc

and instead Arc

, these are the referenced owners and the object will only be deleted when the last owner is destroyed.

Note, however, that they have no disadvantages:

• the contained object cannot be modified without a runtime check; if a mutation is needed, this requires using Cell
  
  , RefCell
  
  or some Mutex
  
  , for example,
• it is possible to randomly form object loops, and since Rust does not have a garbage collector, such loops will leak.