The roots of most of the themes and preoccupations that characterise Poston's jewellery can be traced back to his student days. He has had a lifelong interest in the interrelationship between jewellery and the body, tactility, flexibility, movement, assemblage, problem-solving, and issues around material 'values' and ethics.
Poston has always been absolutely clear on his views about the function of jewellery. In 1975 he wrote 'I believe absolutely that jewellery is for the wearer, not the spectator, since I believe it essential that people should be involved in their own existence rather than in the image of it. The primacy of the wearer demands that the jeweller pays close attention to how the piece of jewellery feels and works with the wearer's body, whether this is at a physical level or a more psychological one.' From this follows his focus on tactility, flexibility and movement.