Classic video game "Pong" played on Philadelphia building

(CBS News) I've played video games using a projector on the sides of buildings before (and highly recommend it). But I can't say I have ever played a game quite on the scale of the one depicted in the video above that pays tribute to one of the legendary classics. Check it out.

I wonder just how many quarters it takes to play? (And where exactly do you put them?) The homage to "Pong" was posted by YouTube user Andrew Cunningham who writes:

The "world's largest game of Pong" as created by Drexel's Dr. Frank Lee. Played at the Philadelphia Cira Centre on Friday, April 19.
A big triple-rainbow salute of artistic-gaming-on-a-grand-scale-excellence goes out to Dr. Frank Lee from all of us here at The Feed! And if you'd like to learn more about the process behind this installation, you can check out the Ars Technica article on it by clicking here.