“Wait.” He points the gun part at my external camera readout screen. He adjusts a couple of controls and the pattern on the rectangle settles into a circle. Looking closer, I see some parts of the circle are a little more raised than others. It looks like a relief map.

“This device hear light. Like human eye.”

“Oh. It’s a camera.”

“♫♪♫,” he says quickly. Now we have “camera” in our vocabulary.

“It analyze light and show as texture.”

“Oh, and you can sense that texture?” I say. “Cool.”

“Thank.” He attaches the camera to the bulb wall and fixes its angle to point at my central screen. “What are wavelengths of light humans can see, question?”

“All wavelengths between 380 nanometers and 740 nanometers.” Most people don’t just know that off the top of their head. But most people aren’t junior high schoolteachers who have giant charts of the visible spectrum on their classroom walls.

“Understand,” he says. He turns a few knobs on his device. “Now I ‘see’ what you see.”

“You’re an amazing engineer.”

He waves a claw dismissively. “No. Camera is old technology. Display is old technology. Both were on my ship for science. I only modify to use inside.”

I think Eridians have a lot of modesty in their culture. Either that, or Rocky is one of those people who just can’t take a compliment.

He points to the circle on his display. “This is Adrian, question?”

I check the exact region of Adrian he’s pointing at, then compare to my screen. “Yes, and that part is ‘green.’”

“I not have word for this.”

Of course the Eridian language has no words for colors. Why would it? I never thought of colors as a mysterious thing. But if you’ve never heard of them before, I guess they’re pretty weird. We have names for frequency ranges in the electromagnetic spectrum. Then again, my students all have eyes and they were still amazed when I told them “x-rays,” “microwaves,” “Wi-Fi,” and “purple” were all just wavelengths of light.

“You name it then,” I say.

“Yes yes. I name this color: middle-rough. My display pattern is smooth for high-frequency light. Rough for low-frequency light. This color is middle-rough.”

“Understand,” I say. “And yes, green is right in the middle of the wavelengths humans can see.”

“Good good,” he says. “Is sample ready, question?”

We’ve been in orbit for about a day now and I activated the sampler right when we got here. I flip to the External Collection Unit screen. It reads as fully functional and even reports how long it’s been open: 21 hours and 17 minutes.

“Yeah, I guess so.”

“You get.”

“Ugh,” I groan. “EVAs are so much work!”

“Lazy human. Go get!”