There is nothing restrained about Yeeun Jang's work. Born and raised in Seoul, Jang works as a floral visual director and botanical sculptor, though what she makes belongs closer to fashion than to floristry. The flowers are enormous, the silhouettes extreme, the colour so concentrated that each piece reads as unreal. Headpiece, skirt, dress, an object held in the hand: the category is secondary, because the first experience is always the same and you are stopped by it. And then, for all that intensity, the work refuses to behave the way extravagance usually does. It comes out the other side elegant, collected, calm.

Colour is doing most of that work. Each piece lives inside a single chromatic world, which lets the eye read volume and construction before it registers variety. Hundreds of petals behave as one material and one gesture. Excess arrives as a single idea rather than an accumulation of effects, and that is what separates this from decoration.

The flowers themselves have stopped behaving like flowers. They are not applied to a silhouette in the manner of embroidery, corsage or botanical print, which is the subordinate position fashion has always kept them in. They accumulate until they become the silhouette. Volume is built from them, not covered in them, and the anatomy underneath is being addressed with the seriousness of an atelier: where the hip breaks, how far a shape can sit away from the body, what a shoulder can carry without collapsing.

Which is where the work enters couture as an idea rather than a classification. Couture's real function has always been fantasy, the licence to make something that refuses ordinary life and to invite you into it anyway. Jang's proportions are implausible and their usefulness is beside the point, and the world they propose is one you want to enter. The scale pushes beauty into something radical. The technical control is what stops the fantasy from tipping into spectacle. Those two forces holding each other in place is the entire achievement.

What keeps us looking is the imagination capable of arriving there. Behind the surface is a mind working scale, colour, anatomy, structure and image simultaneously, and forcing collisions most people would resolve: delicacy against force, nature against artifice, chaos against control, femininity against a physical presence that is close to imposing. Holding all of it in one object without softening any of it is the rarer skill.

Work at this size only looks complete after an extreme quantity of labour, and none of that labour is visible in the result. The craftsmanship never asks to be admired apart from the idea. Hours of concentration arrive in front of us as one electrifying thought, which is the most sophisticated thing about it.

The flowers stop you, yes. But the intelligence behind them is why you stay.