After googling the term "fish stone," I am no closer to its meaning in this song. Apparently, a fish stone is "a stone slab, raised on stone or wooden piers, used for the display of fresh fish. Usually found in market places." Also, there is a stongehenge-esque "fish stone" in Wales, that has some sort of legend behind it. Completely speculating, I wondered, "Could this be a Jesus fish Sufjan is referring to?"
After googling the term "fish stone," I am no closer to its meaning in this song. Apparently, a fish stone is "a stone slab, raised on stone or wooden piers, used for the display of fresh fish. Usually found in market places." Also, there is a stongehenge-esque "fish stone" in Wales, that has some sort of legend behind it. Completely speculating, I wondered, "Could this be a Jesus fish Sufjan is referring to?"