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アイキャッチ画像は、Wikimedia Commons の自由ライセンス写真をもとに、トリミング・ぼかし・明るさ調整・文字入れをして作成しています（1200×675、WebP）。文字にはNoto Sans JP（SIL Open Font License）を使用しています。

元画像作者ライセンス
Mahjong tiles (2317500747).jpgPriscilla from Melbourne, AustraliaCC BY 2.0
Mahjong (53669794).jpegShihao SunCC BY 3.0
Riichi Mahjong real autotable session.jpgTairagi MakotoCC0
Mahjong Tiles (195606345).jpegLian JiayuanCC0
Mahjong 赤牌1.jpgWenlongtianCC0
Mahjong 赤牌2.jpgWenlongtianCC0
Mahjong 赤牌3.jpgWenlongtianCC0
Mahjong 百搭-5.jpgWenlongtianCC0
麻将动物牌.jpgWenlongtianCC0
Mahjong setup wall 1.jpgCangjie6Public domain
Mahjong setup wall 3.jpgCangjie6Public domain
Dice MET 38.40.95left(4).jpg不明CC0
Mahjong (55194221).jpgjoeannenah from QLD, australiaCC BY 2.0
洗牌タイム (4230926465).jpgveroyamaCC BY 2.0
Arcade game table for mahjong video game 2023-04-13.jpgAsanagiCC0
Mahjong setup wall 5.jpgCangjie6Public domain
Tokyo Skytree DSC05774.jpgZengame from Tokyo, JapanCC BY 2.0
Tokyo Tower, Minato City.jpgDavid KernanCC BY 4.0
Minato City, Tokyo, Japan (Night)-denoised.jpgDavid KernanCC BY 4.0
Neon-street-in-Tokyo-Japan.jpgAcediscoveryCC BY 4.0
Bokeh lights by Henry Söderlund.jpgHenry SöderlundCC BY 2.0
Lights-dark-abstract-bokeh (24326849395).jpgwww.Pixel.la Free Stock PhotosCC0
Christmas Lights Bokeh Effect (Unsplash).jpgthr3 eyes thr3eyesCC0
Tokyo-02 (49097184852).jpgRachelle HaunCC BY 2.0
Tokyo 2018 (41491807354).jpgZengame from Tokyo, JapanCC BY 2.0
Light bulb glowing and additional lights in a blurry background. Bokeh effect - Flickr - Ivan Radic.jpgIvan RadicCC BY 2.0
Remote Control, Television - TV-controller.jpgespensorvikCC BY 2.0
Remote control and popocorn from above.jpgNenad StojkovicCC BY 2.0
Cellphone (Unsplash).jpgRodion Kutsaev frostroomheadCC0
Calculator (2198497019).jpgflamingo331CC BY 2.0
2026 Columbus Catholic Men’s Conference (Kasich Hall - Cols., OH) - empty hall before beginning of conference.jpgNheyobCC0
Books stack in Gramedia Book Store.jpgEsther RossiniCC0
Books in stack with lamps (Unsplash).jpgchuttersnap chuttersnapCC0
Stopclock in Suur-Savo museum.JPGMKFIPublic domain
Desk-laptop-notebook-pen (23958719819).jpgwww.Pixel.la Free Stock PhotosCC0
Apple-desk-laptop-macbook (24299816666).jpgwww.Pixel.la Free Stock PhotosCC0
Säynätsalo Town Hall council chamber ballot box.jpgAntti LeppänenCC BY 4.0