SVG image of <i>Union Black</i> by <a href="//commons.wikimedia.org/wiki/Category:Chris_Ofili" title="Category:Chris Ofili">Chris Ofili</a>: a British flag altered to use the pan-African colours. Part of a series with pan-African colours by Ofili first shown in 2003 at the British Pavilion of the 50th Venice Biennale, and subsequently flown from the Tate Britain on various occasions. Since 2017 the flag has been owned by the Tate Britain; according to a <a rel="nofollow" class="external text" href="https://www.tate.org.uk/press/press-releases/chris-ofili-gifts-union-black-flag-tate-britain">press release</a>; it was donated by the artist.
The press release gives the dimensions as 130 x 267 cm or 51 1/8 x 105 1/8 in. According to the <a rel="nofollow" class="external text" href="https://www.tate.org.uk/art/artworks/ofili-union-black-t14773">Tate Britain's catalogue</a>, the whole flag measures 1445 × 2590 mm, corresponding to a 3:5 ratio.
<a href="//commons.wikimedia.org/wiki/User:SpinnerLaserz" class="mw-redirect" title="User:SpinnerLaserz">SpinnerLaserz</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span> flag based on <a href="https://en.wikipedia.org/wiki/File:Union_Black_at_Tate_Britain,_2010_close-up.jpg" class="extiw" title="en:File:Union Black at Tate Britain, 2010 close-up.jpg">en:File:Union Black at Tate Britain, 2010 close-up.jpg</a>