Most practices of nanotechnology and materials science today have foci distinct from Feynman's ultimate vision of manipulating individual atomic position and spin, which may be better described by "Atomic engineering", that addresses characteristic length scales from 1 femtometer (the atomic nucleus size) to 1 nanometer (about 5 atoms across in linear dimension). Coherent quantum control of individual atomic defect like the Nitrogen-vacancy center, and the eventual "3D atom printing" ("2D atom printing" was realized in 1990 by IBM[4] using a scanning tunneling microscope), fit Feynman's ultimate vision.[citation needed]