This McDonald’s Sign is Only Visible at Night

A Canadian advertising agency has created a roadside McDonald’s advertisement which, which has an invisible message during the day. However at night, a ‘Open 24 Hours’ message appears glowing to passers by.

Surely this isn’t as effective as a typical sign, which is visible during the day, and is often lit up during the night, however it’s a very interesting concept which could become very useful in the future.