The two examples shown here are CH₂ClBr, on the left, and CHFClBr, on the right. Chlorine is green, bromine a reddish brown, hydrogen cyan, and fluorine is yellow. A light blue mirror plane passes vertically between the two structures in each window, demonstrating they are mirror images. After a few seconds the CH₂ClBr structures on the left will rotate to show a superposition. Following that, the structures on the right will move to superimpose in the same manner. Clicking the fourth button (Superimpose) will overlay the structures for comparison (atom hues are slightly changed for clarity). In the CH₂ClBr window the structures superimpose in all respects and are identical. This configuration is therefore achiral. In the CHFClBr window the mirror-image structures do not superimpose in all respects ( the hydrogen and fluorine are mismatched; consequently this structure is chiral (the mirror images are not identical). The "ReLoad" button resets the original display.