A bilao is a flat round-shaped rice winnower, a traditional implement in the Philippines. It is usually made from woven wood.
To winnow is to free grain from the lighter particles of chaff, dirt, small stones, etc., especially by throwing it into the air and perhaps allowing the wind to blow away impurities.
Up until a few decades ago, you would see a bilao hanging in the back of the house by the kitchen. And you’d see women using a bilao to adroitly “turn” (toss) white rice grains on it for the purpose of removing unwanted particles, like small stones.
These days, you’re more likely to see the bilao used as a food container. So now, you’re most likely to see it lined with banana leaves on top of which a lot of food is arranged.
Both people who live in the mountains and people who stay on the lowlands enjoy rice as their main food. Growing rice, however is much more difficult in the mountains, especially in the craggy hills of Northern Luzon.