Public buildings fly an ocean blue flag.

Maybe not surprisingly, in the deep ocean, where it's mostly blue, the photoreceptors tend to see blue light.

But maybe Mission Blue can fill in that ocean that we can't see.

Underwater filmmaker Mike deGruy has spent decades looking intimately at the ocean. A consummate storyteller, he takes the stage at Mission Blue to share his awe and excitement and his fears about the blue heart of our planet.

And the thing that you might have noticed about those blue dots is that a lot of them are in the middle of the ocean.

Legendary ocean researcher Sylvia Earle shares astonishing images of the ocean and shocking stats about its rapid decline as she makes her TED Prize wish that we will join her in protecting the vital blue heart of the planet.

I want to throw my big net into the deep, blue ocean of English and see what marvelous creatures I can drag up from the bottom.

Graham Hawkes takes us aboard his graceful, winged submarines to the depths of planet Ocean . It's a deep blue world we landlubbers rarely see in 3D.

So, blue, blue, everything became blue.

Now, there is something deeply moving about seeing ourselves from afar, and capturing the sight of our little, blue ocean planet in the skies of other worlds.

And they said, Blue, blue, we love blue. Let's do it blue.

They get returned, and when they get returned, here on a NASA numerical ocean you can see bluefin in blue go across their corridor, returning to the Western Pacific.

Now, this one is blue, and that's the color of most bioluminescence in the ocean because evolution has selected for the color that travels farthest through seawater in order to optimize communication.

Blue display the blue image channel values.

The walls were blue, the windows were blue, the sidewalk out front was painted blue.

We believe that the oceans were in the northern hemisphere, and this area in blue, which shows a depression of about four miles, was the ancient ocean area on the surface of Mars.

So we start with white, blue, blue, white.

And that prompted people to make maps like this, with all kinds of wonderful detail on the land, but when you get to the waters edge, the ocean looks like one giant puddle of blue paint.

Check out this ad from Blue Cross Blue Shield of Minnesota.

Peter Tyack of Woods Hole talks about a hidden wonder of the sea underwater sound. Onstage at Mission Blue, he explains the amazing ways whales use sound and song to communicate across hundreds of miles of ocean.

I made a whole installation out of blue tape blue painters' tape.

Blue Jean

Yellow. Blue. Red.

Four is blue.

She felt blue.

I like blue.

Blue Bird Aviation

The sky is blue.

The sky is blue.

No blue, no green.

The blue is Africa.

His bicycle is blue.

My eyes are blue.

She has blue eyes.

She has blue eyes.

I'm feeling blue today.

Tom has blue eyes.

Tom's eyes are blue.

You read blue and you wanted to say blue, even though you knew your task was red.

At TEDxGPGP, Jackson Browne plays a song he started writing last April aboard Mission Blue Voyage, the Sylvia Earle inspired trip to brainstorm ways to save the ocean. If I could be anywhere, he sings, anywhere right now, I would be here.

The blue there is India.

How blue the sky is!

The world is mostly blue.

These are the blue bars.

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