"the liquid air of a spring morning"
"eyes shining with a liquid luster"
"limpid blue eyes"

"the cold crystalline water of melted snow"
"crystal clear skies"
"could see the sand on the bottom of the limpid pool"
"lucid air"
"a pellucid brook"
"transparent crystal"

"writes in a limpid style"
"lucid directions"
"a luculent oration"
"pellucid prose"
"a crystal clear explanation"
"a perspicuous argument"