shawl formation in limestone cave by background illumination

abstract attraction australia australian backlighted backlit background brown calcite cave cavern caves closeup colors colours contre-jour crystalline dark detail details discovery display drapery eerilylit feature finest flowstone formation geological geology grotto illuminated illumination inside jenolan light lighted lighting limestone lit magical mineral minerals natural nature old pattern rock scenery secret shawl shawls shot show silurian spelaeological speleological structure structures subterranean system texture translucence translucent tunnel underground underworld vertical layer backlighting