11.   The wings were in royal blue and emerald green plique a jour enamel, a technique that resembles stained glass and allows light to penetrate.

12.   This allows light to penetrate down through the shrub and encourages dense growth.

13.   What made the viewing possible was a special new laser microscope whose light can penetrate surface of the brain and reveal the deposits.

14.   What made the viewing possible was a special new laser microscope whose light can penetrate the surface of the brain and reveal the deposits.

15.   It has a foyer designed like an observatory with floor-to-ceiling glass windows, allowing maximum light to penetrate during the day.

16.   Light can penetrate deep into the organs of the body and certain colors always have the same effect, regardless of where the cells are.