And so, it goes beyond the actual molecular stage  if you can have this compound in crystallised form, as you can most  though you might have to reduce the temperature or whatever, but then  all is gone  gone crystalline eventually  you'll find their crystals are also mirror images  and what he actually did, he painstakingly picked out crystals  which were of one particular shape as opposed to the other, he actually separated all the crystals physically  by using tweezers  and then found that they ha , you know, the two  had a different affect on plane polarised light.