Perceiving ordinary (flat) photos in three dimensions

Hello. As a 77-year-old male, I see certain photographs—in particular large pictures of trees—in three dimensions, especially if I rock my head back and forth slightly to start the illusion. After that the "movement" continues. Images similar to this one that I have attached are especially active. Perhaps best of all, closer objects move more than those in the background. It appears realistic. Rather than ask, "What's wrong with me," I'm more interested in knowing if anyone else has noticed this—what shall I call it—optical illusion? Photos of most trees appear as though a gentle breeze is blowing. And different sections (of the tree) move in different directions, exactly as they do in real life. Thanks.