  We overview lattice data on d=1,2,3 vacuum defects in four-dimensional
gluodynamics. In all the cases defects have total volume which scales in
physical units (with zero fractal dimension). In case of d=1,2 the defects are
distinguished by ultraviolet divergent non-Abelian action as well. This
sensitivity to the ultraviolet scale allows to derive from the continuum theory
strong constraints on the properties of the defects. The constraints turn to be
satisfied by the lattice data. In the SU(2) case we introduce a classification
scheme of the defects which allows to (at least) visualize the defect
properties in a simple and unified way. Not-yet-checked relation of the defects
to the spontaneous chiral symmetry breaking is suggested by the scheme.
