It's virtual gallery of NFTs created by FiftyFive's Development. You can see owner nametage of the art and look at Opensea listing of the NFT right from inside the app. There is integrated chat where you can say hi to other visitors.

You can also get your NFTs featured in the promotion room.

Instructions:
Drag your finger to move view.
To move to other room click or tap on arrow.
When you click on OpenSea link, it copies to clipboard.

Credits:
Music: https://www.bensound.com/royalty-free-music
Free Stock photos by Vecteezy https://www.vecteezy.com/free-photos