The Throne is supported by four pedestals, as was the island Paradise of Manannán Mac Lír in the _Imram Braín_, in imitation of which an island supported upon a pedestal, or pedestals, is introduced into most of the Christian _Imrama_. The pedestals beneath the throne are of precious stone, and from them sweet music proceeds, as from the precious stones which separate the several companies of the celestial choir in chapter 13. Vocal or musical stones are common in Irish legend; instances occur in the description of Magh Mell, just quoted, and elsewhere in similar circumstances, and we may compare the Lia Fáil, which would shriek when pressed by the foot of a lawful king. Parallels occur in the legends of other Celtic nations: _e.g._ in the Breton story of the Groach (Irish _Gruagach_), it is said that every step leading to the palace of that fairy lady sang like a bird when trodden on. The very words in which the _Fis_ attempts to express the beauty of the celestial music are those of the old romances: ‘Though one should hear no other minstrelsy besides, yet should he have his fill of melody and delight.’ The fiery arch above the Throne reminds us somewhat of the watery arch over the enchanted islands of the _Imrama_, in spite of all differences. Probably both were suggested by the rainbow, but it may be that the author of the present passage had in his mind the description in Rev. x. 1 of the ‘mighty angel … and a rainbow upon his head.’ In a note to the translation of this passage, we suggested that the comparison of the arch to ‘a wrought helm, or royal diadem,’ may contain a reference to the picturesque and chivalrous custom of the Irish Árdrí to wear his helmet on state occasions, reserving his crown for the day of battle. The triple circle surrounding the Throne may be intended to symbolise the Trinity.[164] It is noteworthy that while the generality of mediæval legends describing the Otherworld give little prominence to the Triune nature of the Deity, the present Vision contains several references to the Trinity, as do the Vision of Fursa, and several of the later Visions composed by Irish writers or under Irish influences.