landscape preserving eco resort visitor centre integration 2 lower ravine slope 1 5 5 terraced levels following topography contours 2 bridge form structure with continuous open ravine beneath 1 8 natural airflow light preservation 1 5 minimal integrated foundations 1 3 staggered flat roofs with stepped profile 1 4 60 glazed fa ades 40 material composition 2 material palette walnut wood panels vertical horizontal corten steel cladding weathered brushed piasentina stone grey contrast vein cut roman travertine horizontal grooved string courses 2 5 open vegetated underpasses 1 2 shielded low intensity lighting 1 1 topo lock preserve terrain 100 position lower quadrant structure blend 95 no terrain alteration foundation visibility light pollution