Contributed by Jonathan Stevenson / In Mark Webber’s conceptual world, on display at Anita Rogers Gallery, trees gently but surely infiltrate the architecture humans have contrived in their space. They embrace it, disorient it, crack wise about it, and generally take manmade structures down a peg, reminding them – us – that they were here first and have survived the longest. Here there are at least remote echoes of Malcolm Peacock’s massive sculpture of a redwood at the Whitney Biennial and louder ones of Giuseppe Penone’s Arte Povera tree-based sculptures unifying art and nature.