Temporary seating at public events, pop-ups, and outdoor markets rarely gets much design attention. Most options are folding chairs that feel flimsy, plastic stackers that hurt after ten minutes, or nothing at all, leaving people to lean against walls or perch on ledges. The infrastructure to support proper seating is usually already there, but nobody’s done much with it. Scaffolding poles, for instance, are practically everywhere.
That’s the thinking Konstantin Grcic builds on with THING_04, the latest from his Berlin-based label 25kg. It’s a rotationally moulded seat disc made from 100% post-industrial polypropylene, sized to clamp onto standard scaffolding poles. No floor anchors, no complicated assembly, no special tools required. Clip it on, and it’s ready to sit on. The simplicity is almost disarming for something that solves a problem you didn’t know had a solution.
Designer: Konstantin Grcic
At just 33cm x 33cm x 12cm and 2.1kg, THING_04 is light enough to carry in one hand to wherever you need it. Rotational moulding gives it a seamless, hollow shell tough enough for both indoor and outdoor conditions. Galvanized steel and stainless steel hardware handle the clamping, securing the disc firmly onto a pole without any permanent modifications to the structure it’s attached to.
Think of a weekend street market where vendors have already rigged up scaffolding overhead for shade or signage. THING_04 clips onto those poles and turns them into a row of seats for shoppers who’d otherwise be stuck standing. Or a pop-up event where the rigging doubles as a temporary grandstand. The design doesn’t ask the environment to change. It makes the most of what’s already there.
For spots that don’t have any scaffolding in place, there’s the THING_04.u. It comes as a set with a dedicated galvanized steel tubular frame, available with one seat or two. Grcic calls it raw, freestanding, territorial, which is a surprisingly apt description for a public seat that doesn’t need anything to lean on. A plaza, a lobby, a courtyard: it holds its own wherever you put it.
Then there’s the THING_04.x, which scales the concept into a full modular system. More seats, larger structures, and a wider range of configurations make it suitable for everything from temporary events to permanent public installations. It’s available to buy or rent, in predefined setups or custom arrangements on request. The kind of flexibility that event organizers and architects don’t typically expect from a single seating object.
THING_04 fits squarely into what 25kg was built for. The label is Grcic’s own platform for experimentation, where the brief is to start from raw, industrial materials and see how far design can stretch with minimal intervention. Each release is a THING built from these same principles: the stainless steel stool, the lava stone chair, and now this seat disc. None of them wastes a move.
The individual seat retails at €98, rotationally moulded in Germany to the standard the concept demands. It’s a fair price for a piece of seating you can clip onto a scaffolding pole at a pop-up, then carry to the next one. There are scaffolding poles on practically every street in European cities, and most of them have never had a seat to offer. THING_04 changes that.
