From the bottom of the deep blue sea, sea, sea

They say the best things in life are free... this sea urchin shell was a present brought home by my Husband today after a boat trip (I'm not a seafaring kinda gal). I love the colour and the symmetry of it. I also love how Mark can read my mind - on giving it to me the first thing he said was "don't worry, I checked to make sure there's nothing living in it"! It measures 1.5 inches across (I used super-macro for the 1st time!)