Over the following decade and a half he developed a practice rooted in near-total reduction. His characteristic works are paintings in which form is pared back to almost nothing: dark grounds, subtle tonal shifts, and fields of near-black that reward patient looking. In 1974^[2] he produced a series of black paintings, using combinations of dark colours, shown at the Museum of Modern Art Oxford. Number 88, Black/Black/Blue/Violet (1974), now in the Stedelijk Museum Amsterdam, is among the most considered works of British^[2] Minimalism from that period.

Law took up sculpture in the 1970s, extending his reductive approach into three dimensions, before returning to West Cornwall in 1997^[2]. He died in April 2004^[2], aged seventy. His contribution to British^[2] abstract art remained relatively overlooked during his lifetime, though a comprehensive retrospective monograph published by Ridinghouse in 2009, with 300 images and critical essays, has since helped establish his position within post-war British art.