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