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this. Then I let the program figure out the timing needed to draw it with these towers.”
    Kurokawa wrote an equation in midair above the table—an exponential function that had an astronomical number of possible solutions.
    “Mamoru, with only four releases from each tower, there are several billion possible combinations. But there are a lot more than four towers. Fifty trillion combinations? No, even more. How do you derive the sequence you need?”
    “Gene expression programming. You break the random patterns into ‘genes,’ score them for fit, and make them compete. As stronger genes emerge, you add system noise and keep pitting them against each other.”
    “And what you’re hoping is that the release sequence to draw your logo evolves out of the noise?”
    “Right. It’s not accidental. Even with only fifty towers, the search space that contains all the possible messenger release patterns is practically unlimited. The solution is to apply selection pressure to drive the process in the right direction. Different gene mappers have their own selection algorithms.”
    “Interesting. Manipulate the evolution process to speed up the search. Okay, I’ve got it.” Kurokawa laid his pencil on the table and nodded. “Next question. Why couldn’t you render the logo in full color?”
    “They had to limit the number of towers to get Organic Covered Certification. The whole site only has about two thousand towers. With that, I have to render two logos and five cert marks. Even L&B’s total computing capacity probably couldn’t handle all the rendering calculations, and as the logos get more complicated, butterfly effects start becoming a problem.”
    “That makes sense. All right, I think we’re done. You’re an excellent teacher.”
    “You’re a fast learner. I’m surprised. It took me a whole semester to wrap my head around it.”
    “I’m ready for tomorrow. I owe you one. Now let’s deal with your request.”
    Kurokawa took an envelope from his briefcase. As he laid it on the table, I felt a slight pressure in my throat and ears. The environment turned grainy, like old 35mm film. That, and the AR feedback I was feeling, meant Kurokawa had switched to Private Mode. Zucca’s rendering approach was beautiful. It was like being in a Technicolor movie.
    The babble of voices around us faded to a soft, unintelligible drone. Private Mode in public spaces is usually dead quiet, but Zucca’s production values include background noise that sounds like people speaking Japanese. The customers were replaced by avatars instead of gray silhouettes. Zucca had a reputation to maintain.
    “Mamoru, I have the Mother Mekong cultivation logs and TerraVu photos you asked for. I also asked them to collect another sample. Thep wasn’t very happy about that, but she said she’d send you DNA from a full-grown SR06 plant too, just in case.”
    “Thanks, Takashi.”
    Kurokawa tapped the envelope, and it morphed into a standard folder. The security scan ran, and SCAN COMPLETE popped up.
    “They sent me the cultivation logs when they told us about the mutation. I should’ve given them to you then. Sorry about that. I thought it wasn’t necessary, so I held on to them.”
    He was right. The records didn’t contain much that was helpful. Everything jibed with the reference schedule. The intruder had been discovered about ten days earlier. Until then, the crop had been expressing the logos and cert marks exactly as specified.
    “I was hoping this was Mother’s mistake, but these logs look pretty professional. Lots of detail, well-organized.”
    “Thep is still young, but she used to do environmental agriculture consulting out of her own lab at Nankai Institute of Technology in Singapore. She knows her stuff. Mother Mekong couldn’t have gotten all five certifications without her help.”
    She knew her stuff? Two hundred gigabytes of DNA data?
    “So Thep is a woman,” I said finally.
    “All I needed from you was the style