Each of us, whether we like it or not, are constantly interacting and exchanging energy with everything else, for energy is never lost.
I see a flower. A person. Have a conversation. I see it, feel it, hear it, truely. It then becomes a part of me, forever, and I, a part of it, instantly.
If someone or something touches you deeply, you recieve and attach a part of them deep into yourself and vice versa, wholeheartedly.
And that bond that both share will never be broken, for it will forever manifest itself as a memory that will never be forgotten.