Can a sound have a smell? Part-way through this bravura show, performer Harri Pitches described the scent of a scene he’d stepped into – and I realised I was already imagining it, purely from the looping soundscape I’d just watch him build on-stage. That multi-sensory, multi-faceted, bewildering moment perfectly symbolises The Sound Of The Space Between, which melds superlative performance with electronic wizardry to form a haunting study of grief.

The technical artifice is on full display. Pitches opens with an informative tour of his stage: the pedal he can press to make his voice boom, the flashlights he can wield to pick out visual details. But he loses nothing by sharing the secrets of his magic. With his body, his voice and occasionally his guitar, he tells the tale of a journey to a place beyond our world – and it’s mesmerising to witness just how he takes us there.

The mysterious nature of the eponymous Space Between is a key theme of the piece, and even by the end, there’s room for interpretation depending on your beliefs and worldview. This much, though, is clear: it’s a place of comforting familiarity but also horrific dislocation, and once you’ve found your way into it, it’s difficult to leave. Pitches’ fear and confusion as it warps and shifts around him is overwhelming to watch at times, as his tortured and twisting body throws harsh shadows on the bare unyielding wall.

Yet those same shadows, and that same physicality, bring a kind of peace later on – as we learn alongside him what force has brought him here, and what he needs to do to escape it. And it’s in quieter moments like that one that we see the final piece of the jigsaw: alongside his commanding presence and powerful singing voice, Pitches is a first-rate actor. You sense that from the introduction, when his voice suddenly catches, and the mood switches in an instant from anticipation to distress.

This is a show that takes some unpicking, and the surreal ambiance with its ambiguous storytelling won’t delight everyone. But there could be no stronger metaphor for the crooked path through grief, nor a better showcase for Pitches’ stunningly varied talents. Most importantly, as I know from the programme notes, it’s a beautiful valediction for two people he cares about – and a fortifying guide to a journey we almost all have to endure.