The objects in this list all have one thing in common: Each of them has matching sizes in at lease two orthogonal directions. Note that some objects that actually are square for all practical purposes may not be in this list because of some feature that throws off their measurement. Note also, that many of the objects in this list may not actually be square at all, but rather simply have a symmetrical bounding box.
These objects can be found in other lists, but are grouped here by dimensional proportions for your convenience.
The following special objects in this category are restricted for use only by citizens who have been given the "Special Objects" privilege by the world's caretaker: