New kinds of defects can appear in crystals where the atoms and unit cell sit on the nodes of
on three-dimensional projections of N
-dimensional lattices. These defects are the result of the symmetry breaking due to the projection of the structure from N
to three dimensions. Examples are given that illustrate the processes. A new kind of dislocation, here called a `scalar dislocation', is expected; it generates no deformation and has no interaction with stress fields.