世界℃計 / WORLD CL℃K

世界℃計は、離れて暮らす相手の場所の空気を、光の色として灯す照明です。一般的な世界時計が各地の時刻を示すのに対して、この作品は時刻を体感温度に置き換えています。

日本の単独世帯は2050年に44%を超えると推計され、育った家族と離れて暮らす人は増え続けています。メッセージや電話は誰かが送ろうと決めなければ始まりませんが、この照明には操作も確認も要りません。

照明はHORIZON、DISC、GRADIENT、MEMORYの4種類です。相手の場所の気温・湿度・風速・雨から体感温度を求め、3℃刻み36色の表で色にします。21℃が白、−12℃が青の端、60℃が赤の端です。地点や照明の設定、詳しい気象情報の確認には、専用のアプリケーションを用意しました。

WORLD CL℃K is a lamp that lights the air of a distant place as colour. Where an ordinary world clock shows the time in each city, this one replaces time with apparent temperature.

Single-person households in Japan are projected to exceed forty-four per cent by 2050, and the number of people living far from the family they grew up with keeps rising. A message or a call begins only when someone decides to send it; this lamp needs neither an action nor a check.

There are four lamps: THE HORIZON, THE DISC, THE GRADIENT and THE MEMORY. Each computes the apparent temperature of the other place from air temperature, humidity, wind speed and rain, and maps it onto a table of thirty-six colours in steps of 3 ℃: white at 21 ℃, the blue end at −12 ℃ and the red end at 60 ℃. A dedicated application handles the location and lamp settings and the detailed weather readings.

2026年5月 – 制作中

使用ツール：ESP32 / C++ / JavaScript / Python / Autodesk Fusion / Blender

May 2026 – in progress

Tools: ESP32 / C++ / JavaScript / Python / Autodesk Fusion / Blender

国立社会保障・人口問題研究所（2024）『日本の世帯数の将来推計（全国推計）令和6年推計』単独世帯の割合 2020年38.0%→2050年44.3%。

総務省統計局（2024）『住民基本台帳人口移動報告 2023年結果』東京都への15〜29歳転入超過 103,201人。

外務省領事局政策課（2025）『海外在留邦人数調査統計 令和7年版』総数 1,298,170人。

Steadman, R. G. (1994). Norms of apparent temperature in Australia. Australian Meteorological Magazine, 43, 1–16.（体感温度 AT = Ta + 0.33e − 0.70ws − 4.00）

Kuijsters, A., Redi, J., de Ruyter, B., & Heynderickx, I. (2015). Lighting to Make You Feel Better. PLOS ONE, 10(7), e0132732.（照明と気分）

Shin, Y.-B. ほか（2015）The effect on emotions and brain activity by the direct/indirect lighting in the residential environment. Neuroscience Letters, 584, 28–32.（間接照明と快適性）

気象データ：Open-Meteo／太陽高度：NOAA Solar Calculator

National Institute of Population and Social Security Research (2024). Household Projections for Japan (National Estimates), 2024 revision. Single-person households: 38.0% in 2020 → 44.3% in 2050.

Statistics Bureau of Japan (2024). Report on Internal Migration in Japan, 2023. Net inflow of people aged 15–29 to Tokyo: 103,201 in 2023.

Ministry of Foreign Affairs of Japan (2025). Annual Report of Statistics on Japanese Nationals Overseas. Total 1,298,170.

Steadman, R. G. (1994). Norms of apparent temperature in Australia. Australian Meteorological Magazine, 43, 1–16. AT = Ta + 0.33e − 0.70ws − 4.00.

Kuijsters, A., Redi, J., de Ruyter, B., & Heynderickx, I. (2015). Lighting to Make You Feel Better: Improving the Mood of Elderly People with Affective Ambiance. PLOS ONE, 10(7), e0132732.

Shin, Y.-B. et al. (2015). The effect on emotions and brain activity by the direct/indirect lighting in the residential environment. Neuroscience Letters, 584, 28–32.

Weather data: Open-Meteo. Solar elevation: NOAA Solar Calculator.