Strange Dots

The first page of the notebook isn't meant to be seen at all. Run a finger across it and you feel them: tiny raised bumps, arranged in neat little cells. This is a writing system you read by touch, not by sight.

The collector was kind enough to translate the first three lines. Study how the patterns of dots line up with the words, then use what you learn to read the fourth line on your own.

Cats sleep in sunbeams.

We found 3 shells at dawn.

Music can turn rain into dance.

Find the answer to this translated sentence. The expected answer is one word, lowercase.