“You’re fine”, said the doctor. “Just a little hole in the acromion where I took some bone out.”
Well, all right… if you say so. Fine. Of course.
“Does it hurt?”
“Yes, and it’s also numb. May I take a picture of the x-ray?”
The picture you take of the x-ray hanging on the light-box shows horizontal slats of light. The doctor says the photo shows something that’s not there, that the light tubes illuminating the box are vertical. Curious, he starts taking the light box apart and trying to unfurl the mystery, much like he did with your shoulder.
The panels of the light box are easily replaced, the slatted pattern of non-existent light unsolved, ghost in the machine.