As promised... here is the results of one of my students tests of "manmade sea shells".
This handbuilt bottle form shows the marks left by Josh Query's "manmade "seashells". The mix is 50% plaster, 50% whiting, and salt water to mix the stuff up with. Josh wanted shapes of marks that were more rectilinear than what naturally happens with scallop shells.
Was fired in the spring 2017 firing of New Hampshire Institute of Art's #Fushigigama. Was in the last rear stack of shelves.