"Where is 'I'?"
Haru suddenly asked.
Ren raised an eyebrow. "Philosophical."
"The brain? The heart?"
"Scientifically, the brain," Ren answered. "Consciousness is brain activity."
Mio tilted her head.
"But if the heart stops?" Haru asked.
"If the brain lives, consciousness remains. The reverse doesn't hold."
"So I am my brain?"
Ren pondered. "Not the whole brain. Specific regions."
"Where?"
"Frontal lobe, cerebral cortex... but that's oversimplifying too."
Mio raised her hand. Pointing at her chest.
"The heart?" Haru asked.
Mio nodded.
Ren explained. "Metaphorically, yes. But the heart is just a pump."
"But we feel emotions in the chest," Haru insisted.
"That's bodily sensation," Ren said. "The brain interprets chest responses."
Mio moved her hand again. Indicating her whole body.
"The whole body is me?" Haru interpreted.
Mio nodded.
Ren admitted. "There's a concept called embodied cognition. Without the body, no consciousness."
"So just the brain isn't enough?"
"Just the brain is incomplete," Ren explained. "Input from the body shapes consciousness."
Haru pondered. "But with prosthetic limbs, 'I' doesn't change."
"The problem of identity," Ren organized. "What can change while you remain 'you.'"
"Memory?"
"Memory is an important element," Ren admitted. "But memory also changes."
Mio said quietly. "Flowing."
"Flowing?" Haru asked back.
"I'm not fixed."
Ren nodded. "Buddhist anatta. The self is not substance but process."
Haru was confused. "So I don't exist?"
"Not that you don't exist," Ren explained. "Just not as a fixed substance."
"What do you mean?"
"The river metaphor. Same river, but water constantly flows."
Mio smiled.
Haru asked. "So yesterday's me and today's me are different people?"
"There's continuity," Ren answered. "But not completely identical."
"Isn't that scary?"
Mio shook her head.
"Why?" Haru asked.
"Because I can change," Mio said quietly.
Ren supplemented. "Without a fixed self, growth and change are possible."
Haru pondered. "But isn't there something at the core?"
"If anything, patterns," Ren said. "Thinking habits, values, collection of memories."
"That's me?"
"The story woven by those creates self-awareness."
Mio added. "Others create it too."
"Others?" Haru was surprised.
"Others' recognition shapes me," Ren explained. "Social self."
"So there are multiple me's, not just one?"
"Depending on perspective," Ren answered. "The me I think I am, the me others see."
Haru held her head. "I understand even less."
Mio took Haru's hand. "Here."
"Huh?"
"Here, now, Haru is here."
Haru teared up. "Is that enough?"
Mio nodded.
Ren said quietly, "Existence precedes concepts."
"Existence first?"
"Before thinking, already existing. Descartes had it backwards."
Haru took a deep breath. "So where is the subject?"
"Everywhere, nowhere," Ren answered. "No boundaries."
Mio pointed at the window. The outside world.
"Outside too?" Haru asked.
"Environment is also part of self," Ren explained. "Extended mind."
"Tools and places too?"
"Yes. Delegating memory to smartphones, home providing comfort."
Haru pondered. "So where do I end?"
"Depends on definition," Ren said. "Narrowly defined: brain. Broadly defined: the entire world."
Mio smiled. "Everyone's connected."
Haru nodded. "Not alone."
"But also unique," Ren added. "This perspective is yours alone."
Haru looked at the window. "I'm here. But not just here."
"A paradox, but truth," Ren said.
Mio said quietly, "The subject exists in the question."
"Question?"
"The act of asking 'where am I?' is the subject."
Ren was impressed. "Profound. Self-reflective consciousness creates the self."
Haru smiled. "So as long as I keep asking, I exist."
"Yes," Mio nodded.
The three fell silent. The subject is elusive. But that's why it's free.