In Origin Beach, there are two glyphs that are behind the walls in the top left and right corners of the level. These were put in by the developers to answer the question "Why do dolphins live in the sea?"

The left one says:
We hear song in the ocean!
We hear our kind in the sea!
Never have we heard songs in the sea!

The one on the right says:
You sing our song under the waves
Who are you?
Could we sing in the sea?
Could we live in the sea?
Perhaps we will try!