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This stunning waveform depicts a unicorn's ethereal intonations fading into oblivion.

From Chapter 5 of A Field Guide to Identifying Unicorns by Sound by Craig Conley (thanks, Score Bunny!):

Mental whispers may seem:

• like an attempt to whistle
• ever so brief
• confidential
• delicate as thistledown
• familiar
• like a falling feather
• encouraging
• like rain on leaves
• faint
• like a soft blowing
• heavenly
• like a steaming teapot
• peaceful
• like a sleepy sigh
• lulling
• gentle
• soothing
• like a voice from the grave
• enchanted
• husky
• like a rustling wheatfield
• hollow
• like something from ancient times
• like rough cloth brushing along a dusty surface
• caressing
• like bubble bath
• like the wailing of some lost soul
• like an ancient, common tongue calling one back to a communion once shared long ago

“My unicorn can whisper strange things when I want him to, and sometimes when I don’t.”
—Larry Niven, More Magic (1984)