As part of the reflection on the Green and Blue Screens ecological network, it becomes necessary to add a "black frame" component, which would aim to create and protect dark or black areas (Gaston 2013).
Kama sehemu ya kutafakari juu ya Green na Blue skrini mtandao wa mazingira, inakuwa muhimu kuongeza "sura nyeusi" sehemu, ambayo itakuwa na lengo la kujenga na kulinda maeneo ya giza au nyeusi (Gaston 2013).