  A new method of metric space investigation, based on classification of its
finite subspaces, is suggested. It admits to derive information on metric space
properties which is encoded in metric. The method describes geometry in terms
of only metric. It admits to remove constraints imposed usually on metric (the
triangle axiom and nonnegativity of the squared metric), and to use the metric
space for description of the space-time and other geometries with indefinite
metric. Describing space-time and using this method, one can explain quantum
effects as geometric effects, i.e. as space-time properties
