A thick layer of roiling smoke obscured the painted ceiling and the temperature in the gallery approached Saharan levels.
Each successive layer obscures and then partly reveals the one below.
A heavy layer of clouds obscured the moon, the damp, cold air penetrating.
This meant that scattered clouds existed below their flight path while a solid layer of clouds more than two miles above their heads obscured the sun.
A heavy layer of clouds, dark with moisture, partially obscured the topographical features below.
A fake red beard went the way of the rubber cap, but layers of waxy orange makeup still obscured the imposter's true features.
It is possible that a thin layer of dust on the rocks is obscuring the readings.
A higher layer would obscure a lower layer in hardware, unless that higher layer was transparent.
In the Mahler, the effect was mixed: Mahler, after all, wrote his own micromanaging into the music, and another layer can obscure the line.
Only now she has sensibly included many fewer layers to obscure her Gypsy skirts, washed linen jackets, and simple beach dresses.