I like this open or closed sign they have at the library. It’s lit like it is now (like on open book!) if it’s open. When it’s closed it (kinda) looks like a closed book. But you can see it way out in the parking lot before you walk all the way up to the door.
Sorry about the care and reflection, but it’s a window! If you click the photo for the larger version it’s easier to see the unused bits of neon (or neon-like lights), I wish I had a photo of it “closed” to show. Maybe I’ll get one and use it for a different day since this is for my 31 photos in 31 days project.