The natural sunlight that casts its rays across the Upper Gallery, at Modern Art Oxford, adds a shimmering transparency to conceptual artist Daniel Buren's latest work Intervention II, which is suspended from the Victorian crossbeams in the ceiling - the very same crossbeams that held his work in 1973. For that exhibition Buren suspended six squares of vertically striped canvases from the superstructure of the gallery and created a sequence of flowing vertical planes that cut across the space at right angles to the gallery's outer walls. It was much admired.

Daniel Buren is one of France's most renowned artists. His signature motif is alternating white and coloured stripes of equal and of non-variable sizes. His Oxford exhibition in the 1970s marked a stage in the development of his oeuvre, however, as it was the first time he had introduced more than one colour into a single work.

Often referred to as "the stripe guy", because of the many unsolicited public art works he created from striped awning canvas and the hundreds of striped posters he scattered around Paris during his early years, Buren is expressing himself through squares this time.

They are square panels set in aluminium frames, created in exact proportion to the windows of the Upper Gallery, though he's quick to point out that his signiture stripes have not been ignored - if we wish to look we will find them.

Each of the frames is made up of 12 panels of transparent perspex alternately coloured with filters. It's a colour sequence that has been determined alphabetically and heightened and lowered in intensity by the ever-changing strength of the sunlight streaming into the room.

Where we stand, while admiring these pieces and the overall effect they produce, makes a considerable difference, too. Move around the room and you will enjoy a variation on a theme, as yellow hits blue to produce green, and pink covers yellow to give us orange.

In the John Piper Gallery, Buren has transformed the walls by painting coloured squares on them all. Here the aluminium frames contain 18 panels and can be moved along the wall. Buren is quite happy for us to move them, and so change the composition, but he does insist that we pay attention to the stripes he has painted on the track around the room. Stripes on the panels must be perfectly aligned with stripes on the track, only then will the visitor be able to appreciate the complexity of the work and feel the the visual syncopation in it.

You can enjoy this work in different ways. You can admire the way the frames follow a horizontal sequence, or you can bask in it as a work capable of great visual stimulation, enjoying the way the colours interact. I went for the latter - the colours are stunning.

This exhibition is part of Paris Calling, a season of contemporary art from France taking place in galleries, museums and art centres in and around London this autumn. Oxford is one of only two venues outside London involved in Paris Calling.

You will be able to hear Daniel Buren in conversation with artist Michael Craig-Martin on Wednesday, January 24, at 6.30pm and there are free exhibition tours most Saturdays at 3pm. Daniel Buren's Intervention II and works in situ remain on show until January 28, 2007.