When I used to work as a computer tech, I spent a lot of time pulling out and pushing in plugs. For the most part things went pretty smooth, but every now and then my fingers would touch the metal and I'd get an unpleasant shock.
If designer Luofang Jun had this idea back then, my fingers would have been saved from quite a bit of electrified discomfort. The change here is simple, but meaningful: a collapsible skirt at the end of the plug keeps your fingers off the metal prongs, and won't stop you from plugging whatever you desire in. When you pull the plug out, same thing: the curtain will unfold and keep your flesh away from the contacts.
Here's how it looks plugging in:
Via Yanko Design