Ma Yi Xuan's "Double USB" concept swings both ways, meaning it can be plugged in right-side up or upside down. It doesn't matter because the only way you can screw up is by trying to jam the USB connector into a non-USB port.
"The Double USB has two contact layers which are both stretchy," Xuan explains. "This always promises one layer to touch the contacts of the fixed interface, no matter which side is up. At the same time, the other layer is pushed in."
You get the gist of it from the photo below. Our only real reservation comes from the spring action, which we could see wearing out over time, especially for devices that are frequently plugged and unplugged. Otherwise, we're completely down with a reversible USB connector concept.