I fell in love with the Virginia Creeper on a backyard fence today. Beautiful, friendly, comforting, familiar Parthenocissus quinquefolia. Native plant that grows up trees without strangling them, feeds the birds, and looks a helluva lot like poison ivy (and grows in the same places) but is safe for the itch-prone. [Update: Or so I thought, Wikipedia, however, says VC can also cause a rash. Rats.]
I love the second one in inverse, too. Looks like science & chemistry molecules.