Looking up to the bottom of the pipe organ in the church of Faro, you can see a sort of Martian landscape in between the blue Rococo borders. In reality, we believe it is faux-painted to resemble stone, but the effect is quite different. Purposeful or not, the effect on the liturgy must have been striking in conjuction with the cavernous organ tones.
Note the supporting iron bars to the right, and the extended curve on the left to separate it from the narthex.
Igreja do Carmo, Faro