Dialogues: Fiona Grady, Tess Jaray, Bridget Riley and Carol Robertson: Flowers Gallery, London

Comprising precisely delineated geometric shapes, repeated and reflected forms, and subtly fluctuating radiant fields of colour, the works in the exhibition expand upon the experience and perception of surface, depth and movement within pictorial and perceptual space.

Tess Jaray's minimal geometric compositions reflect the order and form found in both natural and manmade phenomena, creating subtly shifting spaces using repetition and pattern, often relating to architectural structures, such as repeated stripes, zigzags and diamonds.  In the Thorns series, the intense contrast of a repeated pattern of cascading vertical arrow-like shapes and coloured grounds creates an ambiguous and intangible sense of perspective and depth, in which colour appears to hover or emanate from the centre of the print. 

Coloured Greys is a suite of three prints by Bridget Riley, produced during a period of the 1970s in which Riley moved from black and white to greys, before working exclusively with colour in the 1980s. Each print in the series is comprised of fluctuating, horizontal waves of subtly modulated greys, which allowed Riley to investigate the vast possibilities of colour combinations, and their interrelation with the curvilinear shapes. Shifting the balance of light and movement through tones of greens, purples and browns, the visual experience is often described as a sensation of water rippling across the surface. 

Carol Robertson's new Free Fall monoprints navigate new territory in her printmaking oeuvre, extending her tonal range into ever more complex colour variations. As the title Free Fall implies, Robertson takes an intuitively playful approach rather than using a pre-ordained system. The central squared-up motif runs ladder-like, top to bottom, inviting the eye to jump from one radiant colour to the next, building complex layers of association from their individual properties. 

Alongside a new series of screenprints Passing Time created especially for the exhibition, Fiona Grady will complete a drawing installation painted directly onto the gallery walls, comprised of a rhythmic sequence of geometric shapes. The prints respond to the structure of the wall drawing, recalling shadows cast within the urban landscape - such as light falling through metal railings or window panes. Grady explores how we measure and understand the passing of time through an awareness of light, with each colour indicating a stretching of lines as the sun rises and sets, emphasised by the cooling of tones as they lighten and become more translucent.