Vasari in his life of Il Cecca contributes much valuable information concerning the machinery used in the shows of S. John's Day.[411] The Piazza of the Duomo was covered in with a broad blue awning--similar, we may suppose, to that veil of deeper and lighter azure bands which forms the background to Fra Lippi's "Crowning of the Virgin." This was sown with golden lilies, and was called a Heaven. Beneath it were the clouds, or _Nuvole_, exhibited by various civic guilds. They were constructed of substantial wooden frames, supporting an almond-shaped aureole, which was thickly covered with wool, and surrounded with lights and cherub faces. Inside it sat the person who represented the saint, just as Christ and Madonna are represented in the pictures of the Umbrian school. Lower down, projected branches made of iron, bearing children dressed like angels, and secured by waist-bands in the same way as the fairies of our transformation scenes. The wood-work and the wires were hidden from sight by wool and cloth, plentifully sprinkled with tinsel stars. The whole moved slowly on the backs of bearers concealed beneath the frame. Vasari attributes the first invention of these and similar _ingegni_ to Filippo Brunelleschi. Their similarity to what we know about the _pegmata_ of Roman triumphs, renders this assertion probable. Brunelleschi's study of ancient art may have induced him to adapt a classical device to the requirements of Christian pageantry. When designed on a colossal scale and stationary, these _Nuvole_ were known by the name of _Paradiso_. Another prominent feature in the Midsummer Show was the procession of giants and giantesses mounted upon stilts, and hooded with fantastic masks. Men marched in front, holding a pike to balance these unwieldy creatures; but Vasari states that some specialists in this craft were able to walk the streets on stilts six cubits high, without assistance. Then there were _spiritelli_--lighter and winged beings, raised aloft to the same height, and shining down like genii from their giddy altitude in sunlight on the crowd.