Relax your eyes until you see a fourth image appear. Depending on whether  you  cross or separate your eyes, one of the two images in the middle will be the correct 3D image and the other middle image will be the opposite direction 3D.

Geology, Quartz, heated to 380 degrees with KCl and NaCl.Plan Apochromat 10x. Note the crisscross pathway of the fluid inclusions. The 3D perspective reveals the outlines of boundaries created at various angles. (Dr. Mike McKibben, UC Riverside, CA.)

Cross polarization image of rock specimen.The great depth of field and increased resolution with the Edge microscope is extremely valuable in the study of ancient geologic environments, in polarized or unpolarized light. (Photomicrography by Dr. Gary L. Greenberg)