This mod is for creating dummy items with the appearance of real items. It is required on both the server and client in order to function.
There is a new "forgery" item made of paper and several dyes, that can be crafted with any other item in order to take on its appearance. It will have none of the functionality of the original item, including crafting recipes, trading with villagers, breaking blocks, or attacking mobs. However it will retain all aspects of its appearance including its
The original item is not lost in the creation of the forgery.
Although mainly it's a great gimmick, here are some use cases I can think of for it.
My point is that there are perfectly good uses of this beyond just trolling your friends, so be creative:)

Create fake items that resemble other items.