Item(s) that Display in the GUI Name & Description that Displays for each Item when hovered over Slot Number each Item is placed in the GUI Command that executes when each Item is clicked ...
The Villager workstations all got GUIs: the Smithing Table, the Cartography Table, the Grindstone, even the Loom. Even the Composter, useless as it is, has some functionality as a Bone Meal source for ...