  Why microscopic objects exhibit wave properties (are delocalized), but
macroscopic do not (are localized)? Traditional quantum mechanics attributes
wave properties to all objects. When complemented with a deterministic collapse
model (Quantum Stud.: Math. Found. 3, 279 (2016)) quantum mechanics can
dissolve the discrepancy. Collapse in this model means contraction and occurs
when the object gets in touch with other objects and satisfies a certain
criterion. One single collapse usually does not suffice for localization. But
the object rapidly gets in touch with other objects in a short time, leading to
rapid localization. Decoherence is not involved.
