Why does my object change it appearance when moving camera I made a bookshelf and used 3 meshes for different books. The other two are looking fine though and i all seamed them the same way and made them out of cubes. 



This one blue book though keeps acting weird. Each time i move the camera it doesnt show the front of the mesh.
What did i possibly do wrong here?
The normals are inverted and backface culling is enabled.

Recalculate the normal by going into edit mode Tab and pressing Ctrl+N.