these...I found these on the beach in Brazil - half an ocean-weathered coconut shell and a few sea urchin shells. I love the intricacy and simplicity of the forms. I keep them on a windowsill and hadn't looked at them for ages until the other day when I found myself transfixed.
The other thing I find interesting about the sea urchin shells is that before they lost their spines they would have been anything but tactile, but these skeletons really invite me to hold them somehow.
Anyway, there it is - the thing that inspired me most today.