Raphael recorded on a smaller drawing but he omitted the tripods on the sides because the available space was smaller. Raphael also added new symbols above the festoons: ascending eagles (at the sides of the altar), a bearded male head wearing a hat in the form of the Chigi symbols with two fantastic beasts (right to the entrance), a siren attended by winged sealions (left to the entrance) and the Chigi symbol of the mountain and the eight-pointed star (under the entrance arch). There are playful details: flowers and berries at the end of the ribbons, birds pecking the fruits of the festoons (both eagle panels) and a small scene of a bird attacking a lizard which is nibbling the fruits (left eagle panel). There is a circular crypt under the chapel with an unornamented, empty pyramidal tomb set in the wall right under the altar which was discovered in 1974. At present this hypogeum is totally hidden from view but before Bernini's reconstruction there was an aperture in front of the altar creating a visual link between the two levels. Dome The dome is decorated with mosaics executed by the Venetian Luigi da Pace after Raphael's cartoon (1516). The original cartoons were lost but some preparatory drawings, that confirm the originality of the work, survived in the Ashmolean Museum, Oxford and Lille. The central roundel represents God, the Father, surrounded by putti, effectively foreshortened in an impetuous gesture, harking back to Michelangelo, which seems to give rise to the entire motion of the universe below. Eight mosaic panels show the Sun, the Moon, the starry sky and the six known planets as pagan deities depicted in half-length, each accompanied by an angel with colourful feathered wings. The figures are accompanied by the signs of the zodiac. The sequence of the panels is as follows: the sky; Mercury, the god holding the caduceus (with Virgo and Gemini); Luna, the crescent moon jewelled goddess holding a bow (with Cancer); Saturn, the bearded god holding the scythe (with Aquarius and Capricorn); Jupiter, the king of the gods with his eagle holding a thunderbolt (with Sagittarius and Pisces); Mars, the god of war holding a sword and a shield (with Scorpio and Aries); Sol, the sun jewelled god holding a bow (with Leo); Venus, the goddess of love with Cupid holding a torch (with Taurus and Libra). A French engraver, Nicolas Dorigny created