Jobe thinks my prized airplane collection is made up of toys!

Naturally, we turned on my electric HO train and sent it running around the top of my office. Jobe then went straight for my airplanes and started to play with them under the neon light. I cannot convince him that these planes are not toys but rather a prized collection not to be handled roughly. He insists they are toys, meant to be played with. And how can I who also loved to play with airplanes and still love little airplanes and big airplanes and all airplanes, stop him from doing so?