Reminds me so much of my childhood on a small island, picking up sea urchins and shells. I'm intrigued by the one on the upper left -- I've never seen anything like it.
@jyokota I picked up a couple of these on 80 Mile Beach south of Broome. There were thousands of flat sand dollars, lots of broken bits of these and luckily for me I found some that were still intact. They're very fragile.
