Sandbox

From the physical switches in an aircraft cockpit, to Nintendo's design philosophy, to the mass secondments Japanese airlines did during the pandemic — a journal entry from a day spent questioning the unspoken assumption that 'returning to where you came from' equals success.

While searching for an alternative to the ski resort my family used to visit, I articulated for the first time why that place was my 'safe bet.' Low crowds, travel rhythm, trust built through experience — it turned out to be a question that extends to product development too.

While researching the mechanisms behind contrast bathing, I arrived at the question of whether 'scientifically unproven' and 'having rational grounds for belief' are truly contradictory. A record of thinking through mechanisms, a large-scale Dutch RCT, and personal experience.

When I asked AI about a synthetic fuel technology, it kept giving evasive answers hiding behind structural explanations. A record of the dialogue process of changing my questions until I got concrete answers, and the question of 'honesty' that emerged.

Exploring the hidden prerequisite behind the common advice to 'be interested in people.' From facilitating a dialogue-based workshop, reflections on the relationship between cognitive margin and organizational structure.

What started as a simple desire to drink iced coffee more easily spiraled into a deep dive on bean varieties. In the end, the deciding factor was a surprisingly simple question: how do I actually drink my coffee?

What started as casual AI chat about tardigrades expanded into reflections on the ethics of animal experimentation, the 'preparedness to be experimented on,' and animal welfare. Preparedness isn't about constant vigilance—it's about being someone who has thought it through.

Starting from a sleepy winter morning, a meandering conversation with AI led me through the history of time management, the distortion of 'productivity,' and a thought experiment about 'programmed humans.'

Starting from Amy Edmondson's 'Right Kind of Wrong,' I questioned the nature of failure and unexpectedly arrived at the meaning of human existence.

When my English articles weren't getting any traffic, I dug into the data. What I ended up doing wasn't analysis — it was learning to ask better questions.

Through dialogue with AI, I uncovered four inner engines driving me — and the desires I still can't fully sort out.

As AI accelerates convergent thinking, time for divergent mode shrinks. I'm not afraid of stopping, yet I'm not choosing when to stop. A reflection through Guilford's theory and the Pirahã people.

When the ability to create loses its value in the AI era, what remains? On the nature of resonance, maintaining distance from competition, and the quiet resolve to write for one person ten years from now.

AI training data is the work product of journalists, writers, and authors who invested real costs. Using it to build products is structurally identical to procurement. That's just how market economics works.

Exploring the discomfort I feel with the proliferation of AI books through a cooking analogy. When the implicit message is 'you don't need to think,' what do we lose?

Working with Claude Code and Agent Teams daily has left me with a persistent discomfort: when AI becomes highly sophisticated, can humans continue to handle 'correctness'? I'm putting my current thoughts into words as a hypothesis.

Starting from a simple news story about J.League's season shift, I explored why they're changing, the relationship with baseball, differences between American and European sports models, and ultimately arrived at the essence of 'design philosophy.' Discover how following the 'why' of a single news item can completely transform your perspective.

A few hundred yen per month in affiliate income. Yet I never felt like I was \"failing.\" Still, there was this nagging feeling: \"Is this really okay?\" Caught between revenue and philosophy, I arrived at a choice: not to \"change how I sell,\" but to \"create a design that doesn't sell.\"

A story about receiving natural yam (jinenjo) as a gift and struggling with how to eat it. Reflections on the feeling of 'mottainai' (wasteful) and the thought pattern of seeking perfection that prevents enjoyment.

The future of AI rewrite competition is automated rewrites. Instead of joining the machine vs. machine war of attrition, I chose a different game: learning-driven rewrites.

Newton, Tesla, Dickinson, Kenji Miyazawa. What distinguishes discovered geniuses from those who remained buried? From ancient Greece to modern social media, the eras of creators and communicators have repeated like waves. Where do I stand, possessing neither? The choice to enjoy the swing.

Long tail strategy enabled 'anyone to publish,' but failed to ensure 'anyone can be discovered.' Large corporations dominate the AI route, and only a handful succeed in the fan route. Economic buffer is essential for emergence, and it's far from 'anyone with talent can make it.' Still, whether something becomes a corpse isn't determined in this moment.

When AI-powered rewriting becomes commonplace, what lies ahead? Beyond the infinite loop of search rankings. Not withdrawing from competition, but playing a different game—a sustainable content strategy seen through the lens of funnel design.

I wrote 15 articles in a month and intentionally spread out their publication dates. But then I stopped. I realized I was trapped by 'appearances' and questioned the essence of writing.

While attempting to develop a diagnostic tool to measure reflective capacity, I faced a profound ethical dilemma. From the warnings of adult development theory to the dangers of measurement, to the decision to create it as a 'holding environment' — here's my journey through this process.

There are many time tracking and task management tools available, but they all assume you'll 'input' something. If you insist on zero input, what must you compromise? I explored automatic tracking tools and found a realistic middle ground.

After brushing my teeth without toothpaste, I got curious and dove deep into researching ingredient differences. From fluoride and hydroxyapatite to sensitivity treatments, I explored countless options. The journey through information overload taught me about finding what's truly optimal for my needs and how to approach decision-making.

I noticed a label on my non-alcohol disinfectant spray saying 'made with food-grade ingredients only.' This led me to research the main ingredient, grapefruit seed extract, and I discovered an interesting gap between natural ingredients and actual efficacy. Here's what I learned about what consumers should choose.

I felt uncomfortable seeing media exposing a suspect's past in crime reporting, and reflected on media ethics. Examining international comparisons and historical backgrounds, I explore the balance between 'public interest' in reporting and human rights.

Now that writing with AI has become commonplace, what constitutes 'valuable information'? I explore the difference between content that merely compiles information and truly conveying one's experiences and thoughts.

From the power consumption problem of AI companies to the weight of 8,000 years, and what it means to document our decision-making process.

The discomfort I felt toward certain revenue models on social media. It was the feeling that they were "eroding trust." On the difference between places to build trust and places to convert it.

Exploring the 'dystopia of efficiency' in capitalism and careers. What the success of fast-food chains reveals about a structure where nobody is to blame, yet everything gets poorer.

After my child was born, the way I work changed. While questioning the 'normal' of 5 days a week, 8 hours a day, I've been exploring my own rhythm within the daily margins.

AI increases productivity, yet leisure time doesn't grow. Through the Pirahã way of life, I reflect on what we've lost and consider alternative paths.