Plane objects were designed primarily to handle crystallographic planes but they should provide useful functionality even in the absence of 3D periodic objects (cells). Plane objects can own directions, atoms, orbitals and texts. The low-level engine infra-structure required to implement plane objects is fully implemented but everything else is not done yet. Plane objects must handle Miller and Miller-Bravais indices and all the related crystallographic relations provided by direct- and reciprocal-lattice representations. Users should be able to choose planes of atoms in cells, clusters or molecules, automatically producing plane objects reproducing those planes, including the atoms and its child, bonds, orbitals and texts, and then handle these new plane objects as totally independent viewing and building tools.