"No Trespassing" signs are everywhere when walking around neighborhoods in the U.S. It might seems like we are free to move around space, but really we are not. We have very limited access to very limited space. Although visually accessible, most spaces are mobility-wise inaccessible. It is almost like Mars. You think you live on Earth, but probably your neighbor's land (private/state-owned) is as hard to enter as Martian land.

This is an anecdotal inquiry into whether it is allowed to trespass neighbor's land on Mars. A 3D model of Martian landscape is retrieved from processing online documentary of Mars through photogrammetry. Then point-cloud and mesh of Cambridge neighborhood are projected and stitched onto the reconstructed Martian landscape.