I didn't know it could do this

Today I realised my Nikon can take a multiexposure image 'in camera', just like the old days when you could expose the same negative more than once to produce a ghostly composite image. Of course in the digital world this sort of composite image is easily made after the fact in photoshop (other photo-manipulation software does exist). And the random combinations that happened when films were re-exposed a second time isn't quite the same as taking two images one after the other and letting the camera's electronics combine them. But it might be the beginnings of an idea...
This combines a row of Grantas on the bookshelf, with a wall light next to a framed picture I was given my my good friend P.