Antireflection coating makes plastic invisible. Antireflection (AR) coatings on plastics have a multitude of practical applications, including glare reduction on eyeglasses, computer monitors and the display on your smart-phone when outdoors. Now, researchers have developed an AR coating that improves on existing coatings to the extent that it can make transparent plastics, such as Plexiglas, virtually invisible. Source 9r.
I can see both pros and cons to invisible plastic. The first con is the amount of things that will get hurt bumping into it.