First, make sure it's easy to refill and smooth to use.Nobody wants to fight with their toilet roll holder whenever they need ...

More than 50 designers have created toilet roll holders as part of an exhibition at LA's Marta gallery. Here, the curators pick their ten favourites.

That's why it's baffling so many people are sharing videos of badly-designed toilet roll holders from around the world on Reddit. Baffling, but also amazing. It's everything you never knew you needed.