This design was from architect Marc Schautteet and it symbolized the eight departments of Boerenbond: agriculture, fruit, vegetables, dairy, poultry, pigs, beef and calves and floriculture. In the middle you can see the logo of Boerenbond and the anniversary year. The organization consists of begonia growers, AVBS - the ornamental plants and green federation of Boerenbond, with logistical support from the city of Leuven.
The video above is a time-lapse of the construction of the flower carpet: an impressive sight!
Source: boerenbond.be