"Drift seeds bob down rivers or cross oceans — I have a dark brown Sea Heart on my desk at the Institute. I picked it up on a beach near Durban, far from the tropical Americas where it might have begun. I've rubbed it like a giant worry bead, glossed its brown skin thinking about its adventures on the currents — Gulf Stream, Equatorial, Canary, Brazil, Atlantic, Benguela, somehow making its way around Africa's tip and up to the tropical sands of KwaZulu-Natal."