Vivarium

Published: March 12, 2026 — Medium Type: Short fiction (69th post) Rating: 2 Stars Source: Read on Medium

Overview

Jack Luo’s 69th Medium post, noted as “shall be a short story” — a deliberate break from the usual essay format. Vivarium is a piece of speculative fiction about a character named Aku, a builder living alone in a cramped apartment that doubles as workshop, archive, and bunker.

The story is technically accomplished. The prose is measured and atmospheric — reminiscent of Ursula K. Le Guin’s quiet science fiction or a Neal Stephenson character study. The world is implied, not explained.

Opening

The noodles had gone slick by the time Aku got the bridge to hold.

Aku works alone at night, blue monitor wash, rain on the window. His apartment: bed, workshop, archive, bunker. A cracked kettle against salvaged processors. Copper wire looped from nail to nail above the desk like a nervous system pinned to plaster.

He’s building a card game — hand-cut cards labeled Delay, Family Name, Patron — to understand why some people move through the world with “the weight of law behind them while others were made to crawl around its ankles.”

Themes

The opening paragraph maps directly onto Jack’s preoccupations: the solitary builder, the system-game obsession, the feeling that privilege is structural rather than earned. Aku is studying power the way Jack studies startups — by modeling the rules, finding the choke points.

The vivarium metaphor: a controlled environment built to observe living things. Is Aku inside the vivarium or building it?

Context

Jack described this as his 69th post. He has been publishing on Medium since at least 2019 (Philmont). March 2026 places this during the Agent School / Agentdex launch period — fiction as pressure release.

Related

• Loneliness And Sacrifice
• Vending Machine Dreams
• Roguelike Card Game

ヴィヴァリウム

カテゴリ： 文章 種類： 短編小説 発表： Medium（第69稿） 最終更新： 2026年4月

あらすじ

主人公のジュリアンは一人で深夜にカードゲームを作っている。モニターの青白い光、窓を叩く雨音。彼はシステムを設計し、バランスを調整し、何かを——あるいは誰かを——待っている。

物語は静かに、しかし確実に進む。ヴィヴァリウムとは、生き物を観察するために設計された閉鎖空間のこと。ジュリアンのアパートも、彼自身も、その中にいる。

文体について

ジャックの散文の中でも特に密度が高く、映像的な作品。日本のシティポップやアニメサウンドトラックが流れていそうな夜の質感——シュタインズ・ゲートの「ハッキング・トゥ・ザ・ゲート」が聴こえてくるような文章。

テーマ

• 孤独と創造の関係
• 閉じた環境の中での自己形成
• 待つことの意味

受容

Mediumの第69稿として発表。RSS経由で確認できた最新の記事であり、ジャックのMedium投稿の中では最も最近のものの一つ。

関連記事

• [[writings/walk-in-the-park]]
• [[writings/dear-dear-jack]]
• [[music/soundcloud]]
• [[people/jack-luo]]