Rev 5:13
And every creature which is in heaven,
and on the earth, and under the earth, and such as are in the sea, and all that are in them, heard I saying, Blessing, and honour, and glory, and power, be unto him that sitteth upon the throne, and unto the Lamb for ever and ever.
John was given VISIONS----He saw all sorts of creatures. Visions are used to represent something.
Rev 5:4 And I wept much, because no man was found worthy to open and to read the book, neither to look thereon.
Rev 5:5 And one of the elders saith unto me, Weep not: behold, the Lion of the tribe of Juda, the Root of David, hath prevailed to open the book, and to loose the seven seals thereof.
In a vision John was shown a book that no one could open, but then Jesus Himself opened it
Rev 5:8 And when he had taken the book, the four beasts and four and twenty elders fell down before the Lamb, having every one of them harps, and golden vials full of odours, which are the prayers of saints.
Because Jesus was able to open the book----all creatures were then praising Him for opening it. Everything praised Him, including the creatures under the sea.
Psa_115:17 The dead praise not the LORD, neither any that go down into silence.
KJV Dictionary Definition: vision
vision
VI'SION, n. s as z.
L. visio, from video, visus.
1. The act of seeing external objects; actual sight.
Faith here is turned into vision there.
2. The faculty of seeing; sight. Vision is far more perfect and acute in some animals than in man.
3. Something imagined to be seen, though not real; a phantom; a specter.
No dreams, but visions strange.
4. In Scripture, a revelation from God; an appearance or exhibition of something supernaturally presented to the minds of the prophets, by which they were informed of future events. Such were the visions of Isaiah, of Amos, of Ezekiel, &c.
5. Something imaginary; the production of fancy.
6. Any thing which is the object of sight.
visional
VI'SIONAL, a. Pertaining to a vision
http://av1611.com/kjbp/kjv-dictionary/vision.html
Visions are given while awake, as opposed to dreams which are given when asleep. They are images used to explain concepts. Visions of animals in Daniel represented kingdoms.