There’s something happening in downtown Austin.

Yeah, yeah, it’s South by Southwest, we know. We’ve heard. So, it’s no surprise there are massive mysterious structures popping up around the city, with little explanation as to what they are, how they got there or what happens inside.

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There’s a giant dome at Fourth and Brazos streets, spotted by Austinite David Busch on Twitter.

Some geodesic dome being set up on my walk to work for #SXSW

— David Busch (@HappySlice) March 7, 2018

He spotted it around 9 a.m. Wednesday on his way to work, and by the time he went to lunch, it was finished -- and branded.

Under armor dome has entered its final form

— David Busch (@HappySlice) March 7, 2018

Apparently the dome is sponsored by Under Armour, and it offers users the experience to find out “what zero gravity really feels like.”

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It’s open to the public from 11 a.m. to 5 p.m. on Saturday and Sunday and will feature various special events and private parties.