How would you explain a rainbow to someone who has never seen one?

Here’s how I would explain a rainbow to someone who’s never seen color in the sky:

Imagine you’re standing outside right after a rain shower has just stopped, but the sun is already breaking through the clouds strongly again. The air still has millions of tiny water droplets floating in it—too small to see individually, but everywhere.

Now picture this:

The sunlight looks white to our eyes, but it’s actually made of every color mixed together—like if you blended every crayon in the box into one super-bright white crayon.

When that white sunlight hits one of those floating water droplets just right, something almost magical happens inside the drop:

The light goes into the droplet

It bounces once off the inside back wall (like a tiny mirror)

It comes back out the front—but when it does, it separates into all its different colors

Each color bends a slightly different amount as it enters and exits the water (red bends the least, violet bends the most).

So instead of coming out as white light again… the droplet sends a whole fan of separate colored beams toward you.

Now here’s the beautiful part:

Millions of droplets are doing this at the same time

The ones that send red light to your eyes are a little higher up

The ones that send violet light to your eyes are a little lower down

All the colors in between (orange, yellow, green, blue, indigo) form perfect bands because they’re sorted by how much they bend

From far away, your eyes blend all those millions of colored rays into one giant, glowing arc that looks like someone painted a perfect half-circle of pure color across the sky.

It appears huge (often stretching across half the sky), but it’s actually made of trillions of tiny prisms (raindrops) working together.

And it only happens when you have exactly the right geometry:

Sun behind you

Rain (or mist) in front of you

Your eyes roughly in the middle

So when someone says “Look—a rainbow!”, what they’re really seeing is:

the whole color spectrum of sunlight… gently sorted, sorted, sorted… by a billion private little prisms in the air… and then delivered straight into their eyes in the shape of an enormous, glowing smile.

Does that help paint the picture? 🌈