You cannot copyright the "shape" of a dress, but you can copyright an original fabric pattern printed on it.

While code is protected as a literary work, the functional "mechanics" of a game may fall under different legal standards than its artistic assets.

A lamp base shaped like a statue is protected as a sculpture, even though the lamp itself is a functional "useful article".

💡 Copyright protects the expression of an idea (the art), not the utilitarian function of the object itself.

If you're looking for something different, are you asking about: for a specific product you've designed? How to register a creative work with the Copyright Office? General productivity or "useful" life advice articles? Useful Articles - Copyright