Sometimes modern designers make changes in the things that at first sight do not need to be improved. But generally afterwards many of those innovations turn out to be useful enough. So it would probably be better if we tried, at least from time to time, not to draw hasty conclusions. Thus it's hardly possible that there is someone who thinks that a coffee mug needs redesigning, yet Jinhong Lin has quite a different opinion about it. To understand better his idea ponder for a moment how the liquid moves from the mug into our mouth. There is a kind of a bridge formed by our lips and the edges of the mug. So why not make these two parts of the "bridge" fit well. Lin's mug has a curved edge to better trace our lips while we get our coffee or tea.
Despite the insignificance of the changes to the coffee mug design proposed by Lin, it's not a bad idea. Who knows maybe after some time such coffee mugs will replace usual ones. 
