It’s a really good exhibit— some things specifically related to the pittsburgh area such as the demolition of the Braddock Hospital. But back to your comment— I also thought the title was intriguing. In my late 20’s & early 30’s I used to write poetry that included “dark matter” in the subject—fascinating & yes— scary topic when you think about the universe expanding. I submitted the poem to a literary journal but it was rejected 🤣