This surreal home gym turns a cave-like room with porthole windows into an underwater cosmos. Cobalt plaster walls, lava rock edging, and sculptural seaweed flank a charcoal‑gray herringbone stone floor. A fiber‑optic aurora shimmers beneath exposed timber rafters, with halo and Saturn pendants. Glowing Himalayan salt dumbbells on stainless racks warm the palette, while iridescent stars and a shag moon tote heighten the dreamlike mood.