Terry Pratchett. Masquerade (№ 35403)

Yes. All very carefully arranged. One big lie.
- Last night you said you understood.
- Well, Yes, there is a lie. Same lie as with masks.
And what lie is with the masks?
- I say masks hide people's faces.
- So what? Mask really hide the face!
- Not on the face, and the face. Only what is outside