switch between visualization modes to prevent this 

The arches are fun to try to align with. These two are not on the same hyperplane, so you can't have both in the volume of sight. 

 

average level: 

 

 

Oh yeah, just do a half-turn and everything is mirrored, haha! Surface volume makes things easy to understand, too. 

Out of context spoiler 

do u have games on phone