In an extremely ambitious wall painting that’s sited on his studio rooftop Rob demonstrates terrific free hand skill. This work – which the artist describes as in part exploring the psychology of colour – seems to inform the YSOM poster installations appearing at Shoreham Street and Charles Street. An endless wave is suggested by these visual ululations, the dark red/blue and yellow/light blue pairings being different colours but the same tone baffles the eye. It’s a delighting semblance of movement that cheerily ushers passers-by on their way through the city streets.

A second design appearing in vertical and horizontal formats again is an op art classic. Parallel lines pile up and wrap around the phrase ‘Honesty is the best policy’.

Discussing the choice of phrase, Rob says ‘In a world where dishonesty is rife, misinformation prevails, and integrity has seemingly all but disappeared, this common expression has never been so relevant. I created these posters to remind us all of this truth.’

With the colour version Jim Lambie’s brilliant tape installations spring to mind; the black and white iterations throb and oscillate, setting up a dynamic intrigue as our eyes and minds flicker between reading the message and decoding the spaces from which it rises and falls like a beating heart.

Onetime curator of New York’s MOMA William C. Seitz suggested that “Op art works exist less as objects than as generators of perceptual responses.” In Rob’s posters that use text a question of morality shivers amidst the formal invention. These works, yes, play wow games with our eyes but also hopefully hypnotise with their pulsing message of collective integrity.