Sneaky Animated Dendrome Wall

Well, I definitely didn't invite three to the party, but Animated Dendrome Wall decided that uninvited guests were the best type of surprises.

I don't know if this has been addressed before (wasn't able to find anything about it with a quick google search), so I thought I'd bring it up.

I'm not sure what's happening here - I noticed this a few months back and forgot about it until I popped in to one of my storage dimensions. No matter which dimension I have place an Animated Dendrome Wall in (so far - effect confirmed in Anywhere, Azcu’azg Oasis, and Mathosian Cascades), if I back away to a certain distance, two pillar structures appear beside it. These structures stay beside it until I back up past the distance my graphics settings allow. They don't contribute to the item count (thank goodness) but they do add a bit of spookiness to the dimension. While this is a rather interesting effect, does anyone know why this is happening, what the two pillars are or why they accompany the Dendrome Wall?

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Sneaky Animated Dendrome Wall