Celestial by Nullish NFT Overview

Celestial is a collection of 1,065 on-chain art NFTs created by developers and creative nullish on the Ethereum blockchain. Each NFT changes and updates after spending a certain amount of time in a single Ethereum wallet. After being held for 7 days in the same wallet, an additional level is added to the NFT's level count once the holder calls the upgrade function in the smart contract. Every additional 7 days an NFT remains in the same wallet the same upgrade function can be called by the holder to increase the level count and in turn, increase the cluster count.