Humanity's second oldest visual art form (with drawing/painting being the oldest), this is also my own second longest-practiced art.

My most-used medium is Sculpey III polymer clay. It has the molding properties and color range of modeling clays, but can also be hardened in the oven. I've also used regular modeling clay, actual kiln-fired clay clay (though I no longer have access to a kiln, so that's not really possible anymore), carved soapstone, and I've constructed pieces out of non-molded materials (for example, the eyeball "floating in a glass of water" which is actually acrylic vase filler)