FROM Vietnam to Chiang Mai, from Yogyakarta to Guangzhou, architect Hijjas Kasturi was extraordinarily busy criss-crossing the region last year. His mission: to buy furniture, household fittings, wood carvings, doors, tiles, antiques. You name it, it is on his list. 'It was fascinating. We discovered many types of old material still being made by hand,' he said, showing off a tile from Vietnam that was...