Image is 500 pixels across, the originals are 4096 pixels across.
(above) water molecule with cloudy reflections
Water: consists of one oxygen atom (red) covalently joined to two hydrogen atoms (bluish). H2O is a highly polarised molecule which leads to hydrogen bonding among the molecules. The cloudy translucent spheres reflecting the sky represent the "surface" of the molecule and are created from the van der Waals radii of the constituent atoms. The solid reflective inner spheres represent the covalent radii.