That is such an ingenious idea, Mark, well done!! I particularly like how you have put together two things that deal with sun/ light and turned it into a new invention - and also thought about the temperature factor. You are right, the temperature inside the car is often an issue to control!! Do you think people could choose the style of their sunglasses too? That could be really fun to easily change how a car looks.... I can't wait to see what other inventions you come up with!!