Camera.

Quick link to the Reeder app

John Gruber made a shortcut that triggers mute if the device is laying face down on the table and otherwise launches the camera: shortcut.

Edit, small hint: Actions App is required to detect the face down orientation.

Planning to make Focus-variable Shortcut. For example, if current Focus is Sleep, then action button toggles bedroom lights. If current Focus is Work, then action button connects to Bluetooth speaker and plays Spotify.