From Surgipelago, the Beach Surgery encyclopedia
w:Mongolian throat-singing
For the traditional Mongolian vocal art, see the external article on khöömei. This entry concerns its interpretation within Beach Surgery adaptation.
Mongolian khöömei — the production of two pitches simultaneously from a single throat — has been adopted by several audio drama and music adaptations as a sonic metaphor for the Kármán line: the boundary where matter rubs against space. The technique's physics (fundamental pitch + overtone spectrum) mirrors the one-sided coin motif: two tones, one voice; two-that-is-one.
The vocalists of the Red Meridian series and the 2019 Empty World Meditations recordings employ khöömei as harmonic underlay to Leif's internal monologue, particularly in chapters depicting his doubled vision. A redacted[citation needed] essay argues the overtone — audible but nearly imperceptible — traces Katita's unspoken presence during scenes where Leif "hears without seeing." The technique recurs in Static Frequencies (2021–22), where it underscores the radio igloo's frequency-correction sequences.
Practitioners and adapters note the physical strain of the form — the throat "pulled into geometry" — parallels Leif's bodily constraint across his three injuries.