On Saturday, don't visit Gloucester Green Market first. Instead, visit the  Ashmolean Museum on Beaumont Street and ask to see the John Constable painting 'Willy Lott’s House'. Stand as close as you can without causing alarm and look at the detail of the brushstrokes and the colour. Are you mildly underwhelmed? I know, me too.

Now, stand three paces back. Look at the painting afresh.

 

What magic is this that transforms our eyes to see such depth and detail.....

 

The flecks of light that John Constable used to inject life into flat surfaces and erratic elements of nature are taken one step further in these images of Oxford by Dorothy Megaw. Follow the trajectory of light, as it bounces off the walls, streaks through the Streets and whizzes past the shop fronts in her latest work at Gloucester Green Market this April.