Weighing in at nearly 2.5 ton, Hugo França 's  new 'casulo' (cocoon) sculptures are awe-inspiring in scale and  ambition. The artist uses hardwoods indigenous to his native Brazil to  create his monumental organic artworks and sinuous furniture, currently  on show at R 20th Century Gallery  in New York, crafting each piece from ancient 'pequi', a gigantic oleaginous tree that averages 45m and can live 1,000 years.   A committed naturalist, França is  meticulous about the way he sources the wood, traveling through the  forests, sometimes for days, in search of solid trees that have been  felled or died naturally. Each casulo is then 'refined': carved, smoothed and shaped from the  trunk or roots to create an organic space of retreat and contemplation.  When finished, it inspires what he describes as 'a bonding experience  between man and nature'. He encourages people to get inside the  sculptures, 'as if they were a part of it'.   Thanks Wal...