Is it art?

 
Joseph Beuys said: “It's art if I say it is art.”
 
Do you agree?
 
Well I have been to Art College and the consensus of opinion is that it is art. As one art historian said:
“ If something is in a museum or gallery then it has been judged by a curator to be art.”
 
I do query the logic of this statement since a dog is a dog whether it is outside or inside a gallery. It does not become a cat because you, the artist claim it is.
 
As for this image, it happens to be a jar of nails in our kitchen cupboard (yes I was desperate for a blip today).