Now here’s a solution for couples who argue about who gets too much space on the mattress. Designers Isabel Machado and Filipe Pinto have come up with the bedsheet ruler bed cover. And it may just save your marriage! Really. For one thing, you can treat this as a game to spice up romance in the bedroom, like if he or she crosses your side of the mattress, there is a light and playful penalty involved.

The bed ruler is a cool idea since now, you have an exact measure of space on the mattress which will hopefully limit the arguments in the bedroom.

via Experimental Design