The beasts and the birds were there. Artists and composers showed their creations. Fancy buildings and huge ornaments vied for attention. An exhibition of forms, a symphony of colors composed of millions of flowers. All on large wheeled floats, traveling the flats of Holland between Leiden and Haarlem. Every April the “Bloemencorso van de Bollenstreek,” the flower parade in the heart of the flower-bulb region, is one of the top five tourist attractions of the Netherlands.