During one of the meetings here at the office, I saw out the window a twirling leaf fall to the ground. It reminded me of the helicopter maple seeds, but I knew the tree outside is an American Linden. (It's actually one of the biggest/oldest Lindens in the state and the design of the new building is a response to the desire to keep it.) My curiosity aroused, I looked at the falling leaves when I left the meeting and here's what I found:
The leaf itself is wonderfully developed into a natural helicopter shape, with the seed, as ballast, growing down from the middle.
The whole tree (note that it is still green - it seems just a few leaf/seeds are falling right now).
The curb collects the pale golden curls.
Very cool, isn't it?