I have a Problem with duplicating Polygon cubes. I made the wall for my footballstadium with polygon cubes. After that I duplicatet the cubes in negativ 1 for the other side. Then I wanted to add any details for the wall, for that I had extruded any faces. But when I did that, the Faces from the other side did the same translation, but why? I never select them and I did not extrude that faces on the other side. Delete the History was unsucsesfull. I tryed that in a new project to fix out what it is, but without any result. Have you an idea!