Stating the fact that a move to the side and slight rotation is more than enough to hide the rock is not a personal attack. the rocks on the left side moved to the side enough for the rock on the right to be hidden. the faint red line at the top was to the right of the rock in question before and now, though it points to the same crater in the distance, it is now right next to the large rock. You can also see that the large rock is slightly rotated. All of that together makes it a fact that it is more than enough for the rock in question to be hidden by the larger rock. It also appears to be a fact that YOU have trouble visualizing in three dimensions.