Just put frosted markings on the glass. It’s really not that hard. If you wanted to spend lots of money to keep it clear all the way through. Add track lighting to wash the glass. You would then see the reflection as you got close.
The glass should be beautifully etched; Perhaps with baskets full of apples, or Johnny Appleseed relaxing under the apple trees or Issac Newton with apple in hand (it is science, after all). Knock yourself out!