exterior hut hut-roof layers layers-of-thatching light reeds roof roofing shadows shelter textures Thatched thatched-hut thatching thatching-reeds thick hut roof layers of thatching thatched hut roof 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