# 4.7. Public objects

3D models that users publish in the Unisphere become 3D objects or public models. All residents can see and interact with them. 

Before publishing models, it's important to customize them, because after that it will be impossible. When sending a model to the Unisphere user should choose a lifeTime for the object. It is counted in hours. When the lifeTime is up the object disappears. Owners can prolong Time by adding extra hours in the Profile menu.

<figure><img src="https://1434903589-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FJ50hs1apdrvVxWHgtHVk%2Fuploads%2FXuycEpnnWcsanZyC2JHG%2Fimage.png?alt=media&#x26;token=8efd128a-554e-4ff4-9fc9-389d62132807" alt=""><figcaption><p>Differences between 3d models and 3d objects</p></figcaption></figure>