The ten-metre field of yellow strands standing near Serpentine South has nine days left. Jesús Rafael Soto's Pénétrable BBL Jaune (1999; 2023 Edition) closes on 25 October 2026, after a four-month run that made it the first outdoor presentation of the Venezuelan kinetic artist's work in the UK.

The work is exactly what it looks like from across Kensington Gardens: 4,000 identical yellow PVC tubes suspended from a rectangular steel frame, a walk-in volume that visitors are invited to push through. From a distance the curtain of strands flickers with a moiré effect, appearing to drift before you have moved at all; up close, each passing body sets the tubes swinging and reshapes the space. It is the classic Soto manoeuvre — a sculpture that only completes itself once a viewer steps inside.

Pénétrable BBL Jaune was first conceived in 1999 and relaunched by the artist's estate in 2023 for the centenary of Soto's birth. It belongs to the Pénétrable series Soto began in 1967, the point at which his interest in optical perception extended fully into three dimensions and into the viewer's body. Across a seven-decade career he built more than seventy Pénétrables in varying sizes and colours, becoming one of kinetic art's defining figures.

Perrotin's London Art Week newsletter flagged the installation this morning as one of its artists on view during Frieze week — a reminder that with the fair's VIP days over, this is the last chance to catch it. The final weekend, 24–25 October, coincides with the closing days; Serpentine's outdoor summer programme gives way to its autumn calendar after that.