“Arca works in two modes. There are his longform pieces, like last year’s astonishingly precise Mutant, which twist and unfurl as singular landscapes, as ecosystems inextricable from themselves. Then you get the solitary organisms, isolated and breathing on their own time. "Urchin," maybe an afterthought to Mutant or maybe a scrap from its cutting room floor, appeared at the close of 2015 as, until”
