Fly-Through Glass
Black Markers
Transparent or semi-transparent glass is considered fly-through because birds see greenery and/or sky on the other side without realizing that there is a barrier preventing them from reaching it. Bus shelters, clear railings, and walkways between buildings are just some examples of fly-through glass. Fly-through glass must be treated with a high-contrast hue, like our black markers, which stand out against the light shades of the sky and clouds.