So much time it took to put up a correct question ... ÷) ÷).
Impermanence : It is defined at atomic level for tiniest possible energy particle which shows dual nature :: matter(as existence) and wave(as non-existence or Maya or Delusion).
Whatever happens due to this dual nature , is called as change.
Change seems to be intelligent to a human till it makes one happy ,otherwise it seems to be a curse. Change is intelligent upto what seems to be good. But ,my friend , what seems to be good is ,in itself, a biggest hinderance than not-good. Pain, actually ,is a pleasure in early form. When one gets used to this pain , it becomes pleasure and seems to be intelligent.
Fruits of change in living beings is due to Ignorance and in non-living beings is due to chemical reactions. Now unless you are a believer in God or something like that , it won't create a confusion otherwise you might think who is causing these chemical reactions. Such questions are hindrances to meditation. Sit again and try to analyze that seems to be intelligent to you , it's just a pleasure feeling. Otherwise ,when you see it WISELY , it becomes merely cause and conditions passing by while Ignorance as stand-by...÷)