59 RC Passage 3
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going to have to probe you more on 20. i did choose C in fact, and while i see how E is structurally fitting, how its small and how all the other answers besides C were very off, i dont see how C is so wrong. you say it "does have a shape but you cant see it directly only through reflections" seems to fit C text of "appears (but does) to have no shape"...

Gah. I DON'T WANT TO BE PROBED.
OK, OK. Question 20: in order to support an answer choice, we have to have firm evidence from the passage. Here, there's no indication that the sculptures don't have a shape of their own. In much the same way that a mirror on a wall reflects its surroundings while also having its own shape, a reflective sculpture reflects while retaining its shape. In fact, the author makes this clear at the end of the fourth paragraph; the sculpture has both a shape and dimensions, which viewers can derive only secondarily (hence my explanation in the video). The sculpture certainly does NOT take on the shpae and dimensions of the surrounding objects, in the same way that any other mirror doesn't take on the shape and dimensions of the objects around it.
Or, put it this way: look at the thing (it's on the right). It clearly has both shape and dimensions.

cool cool...unfortunately, probing is something i think we're gonna have to get used to once they finally reveal the dirt about our ET overlords

Ah, well. After 2020 so far, that's almost something to look forward to...