Its based on a song by Incubus called The Warmth.

Excellent song.

At the beginning of the song is audio track of whale sounds or whales talking. The song opens up with that. It gave me this idea to do one of those "Visit Colorado" or "Experience the Grand Canyon" vintage looking posters. I drew the first rendition of it in my monthly planner (see below). Then I sat on the idea for a few months. Finally made the poster. I still want to dress it up a bit and fix some color issues.