  We review properties of lower-dimension vacuum defects observed in lattice
simulations of SU(2) Yang-Mills theories. One- and two-dimensional defects are
associated with ultraviolet divergent action. The action is the same divergent
as in perturbation theory but the fluctuations extend over submanifolds of the
whole 4d space. The action is self tuned to a divergent entropy and the 2d
defects can be thought of as dual strings populated with particles. The newly
emerging 3d defects are closely related to the confinement mechanism. Namely,
there is a kind of holography so that information on the confinement is encoded
in a 3d submanifold. We introduce an SU(2) invariant classification scheme
which allows for a unified description of d=1,2,3 defects. The scheme fits
known data and predicts that the 3d defects are related to chiral symmetry
breaking. Relation to stochastic vacuum model is briefly discussed as well.
