The Interlocking Two-Tone Kidney-Shaped Upholstered Low Stool, model MOD-KID-STL-GY400, is an unbranded modular low seating solution designed for flexible public space deployment. Its distinct curved kidney form features a two-tone grey and yellow matte polyester fabric finish, with fully rounded soft edges across all exposed sides for a gentle, approachable visual profile. Single modules measure 850 mm wide, 550 mm deep, and 400 mm tall, with a 400 mm seat height, and may be nested together via a purpose-built concave interlocking notch to create custom curved or linear seating layouts, or used independently as standalone casual seats. Each unit’s construction pairs a rigid internal structure of 15 mm thick multi-layer solid wood board, 14 mm bent plywood support panels, and 9 mm hardboard backing with a 35 kg/m³ high-density high-resilience polyurethane foam core, upholstered in tight-weave matte polyester stitched with high-tenacity nylon thread at a rate of 8 stitches per 30 mm for durable, consistent seams. Low-VOC water-based adhesive bonds core layers, and 15 mm diameter black non-slip nylon glides are fixed to the base, lifting the unit 5 mm above flooring surfaces to prevent scuffs and slips. The upholstery delivers 30000 Martindale cycles of abrasion resistance, and its tight weave supports easy spot cleaning for regular public use, with each single-seat module supporting a 150 kg static load at a net weight of 12 kg per unit. This stool suits a broad range of public settings, including hospital, office, and transit station waiting lounges, department store rest zones and pop-up retail displays, kindergarten common areas, informal office breakout and collaboration spaces, trade show and temporary event seating, and modern reception lobbies. For procurement, note that provided engineering data supports preliminary quotation rather than final supplier-verified measurements. Each set ships across 2 cartons with a total packaged gross weight of 23 kg and total carton volume of 0.26 m³, requiring a reference assembly time of 40 minutes per set. The visible two-tone grey-yellow finish is offered as standard, supporting coordinated visual design for public space schemes.