You know what's really nice? Coffee. With friends, at work, whatever. Coffee. You know what's less nice? Coffee stains.

And it's not like having said stains on a coaster makes it any better. Because then the coaster is dirty and it's making your table look messy and it just doesn't look very nice. But it's okay, because Korean designer Kim Keun Ae has found a solution to the problem of coffee rings.

The 'Drop Rest Cup' has a small groove going around its circumference, which collects drips and spills flowing down the edge. The groove essentially stops the droplets from going any further, meaning your surface of choice stays stain-free.

Yes, it's a simple design. But sometimes the simplest solutions are the best.