êkhos (ἦχος) — the Greek word for sound, echo, resonance — is a stereoscopic anaglyph audiovisual installation by Mariusz Szypura, presented at Lincoln Center NYC during the Unsound Festival.
The work uses red-cyan 3D imaging combined with multichannel spatial sound. Visitors wear stereoscopic glasses to experience parallax-shifted visual fields synchronized with sonic events that move through the room.
The piece extends Szypura's ongoing investigation of cross-sensory perception — how visual depth and acoustic depth share psychoacoustic mechanisms in the listener.