Based off of "Perimeter", an RTS by Russian developer studio K-D Lab, Frame is a mobile city created to traverse the treacherous and ever-changing bubble worlds of Psychosphere. The city itself is but a tiny part of the Frame which also houses machinery to maintain base when on-world, as well as mystical Spiral, a device that allows inter-dimensional travel.
Here are separate pictures of the city and the structures built around it:
The City
The Core
The Core is a vital part of the base built around the Frame. It accumulates and transfers energy, collected from the world's surface, to the Frame. It also powers the structures that are not directly connected to the Frame when they are built within the colored zone around the Core.
The Lab
This is one of the laboratories that a player must build in order to access new units within the game. This particular one allows access for laser tech-based units.
And here is a reference image, an in-game screenshot of the Frame and four Cores: