If you approach my sitting room and the door is closed, you will see the little navy blue pillow that hangs on the knob. If it's backward you just see a navy blue square. But if I'm writing, it's flipped around so you can read this message:
"Quiet please. Novel in progress."
And if you put your ear to the door and hear any song from Norah Jones' album, Come Away with Me, just pass on by.
Serious work in progress.