"Transparent Background".
I try to make a cape, using a transparent background pattern in Photoshop．That way people in the city who want to be invisible can wear cloaks, and those who don't need to be invisible don't. People who are being photographed will have pixel blocks on their heads to form screen pixels, with the entire city as the backdrop, while those who are not being photographed can have bad pixels on their heads so that they don't interfere with the overall "screen play" and can hide themselves．