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But parent is also right metaphorically. Once the car starts moving, consuming energy and filling traffic, it is not longer invisible to the world.

He's not a killjoy. It only works in the video. If you saw it on the street, at another place except directly in line, it would just look silly.

They use a deceptive camera angle to make it look like it works much better than it does in reality. As thoughtful people, what are we supposed to conclude about hydrogen fuel cells?

It's still a great ad, and I enjoyed it. Some of the secondary press coverage is terrible though (PC World: "Mercedes makes invisible car, tricky to find where you parked it"; says that if the invisibility isn't perfect, it's because the LED sheet is too low resolution.)

I actually really appreciated that comment, because I had forgotten about that and was thinking "wow, invisibility is way easier than I thought."