exterior hut roof layers layers of thatching light roof roofing shadows shelter textures Thatched thatched hut roof thatching thatching reeds thick hut hut-roof layers-of-thatching reeds thatched-hut thatching thatching-reeds angles architecture Asia base bases build building constructed construction flat foliage materials rustic shade shading slope sloping structure surface surfaces texture textured thatch triangular background material natural nature plant protection reed stem straw