The ëfuso is a mug accessory which eliminates pesky coffee rings. The design was the winner of Dwell Magazines "Innovate It!" industrial design challenge. Below are the jurors' comments:

"The ëfuso is an accessory to existing mugs that takes biomimetic cues from nature: It employs hollow channels and canals—similar to the xylem in plants—that take advantage of the cohesive properties of water to siphon off and store any liquid that leaves the mug, either from stirring or drinking. The design earned high marks for sustainability because it's made from repurposed tire rubber and it eliminates the need to replace existing mugs. Another advantage of the ëfuso is that it could be applied to all manner of hot-beverage receptacles—different size ceramic mugs, travel mugs, etc."