In Dougie Wallace’s photos of Mumbai taxis, the chatter, yelling, and constant horns of the city are almost audible. A selection of his images is on show at Gayfield Creative Spaces, Edinburgh, as part of the Retina photography festival until 30 July. For four years, the Glasgow-born Wallace focused his photos on one kind of taxi in particular: the Premier Padmini, a 1960s workhorse painted in black and yellow. Locally known as “Kaali-Peeli”, there were once more than 60,000 of them in the Indian city. But thanks to laws restricting pollution, the cars now are fast disappearing from Mumbai’s streets. (Photo by Dougie Wallace/The Guardian)

“Born in 1965 at Tokyo, living at Tokyo. Starting shooting since 2008. 2011: 1x Photo Awards Honorable Mention (Street). 2012: Black and White Spider Awards 2nd Place (Portrait), Honorable Mention (Fashion); PX3 Gold Awards (Press); Israel Harvanism Street Contest 1st Place. 2013: Urban Picnic Street Contest Top30 Finalist; PX3 3rd Place (Portrait), Gold (Portrait - Personality), Gold (Press - People/Personality); Photolux + PhotoVogue Photo Contest 1st Place. 2014: Sony World Photography Awards Commended (Smile Category)”. – Tatsuo Suzuki. Photo: “Spring”. (Photo by Tatsuo Suzuki)

A passenger waits after his train arrived in Nouadhibou, Mauritania’s second largest city and the main export port for the country’s iron ore industry, on June 25, 2014. The mining company’s employees proudly call their firm the lung of their nation's economy and the train that ferries the ore to the coast stretches some two kilometres, making it one of the world's longest. SNIM mines black iron ore in the northern town of Zouerate, a remote desert location which nevertheless attracts people from all over the country looking for work. (Photo by Joe Penney/Reuters)

Have you ever heard of a psychological phenomenon which lets us easily understand words, even if the order of letters is mixed up, as long as the first and last letters remain in their rightful place? Similarly, the art works of Michael Turner use only two colors to highlight the main futures of well-recognized superheroes, allowing our imagination to create the rest of the picture. The colors used in the pictures weren’t chosen at random. They perfectly reflect the key characteristics of the superheroes that they depict. For example, the picture of Flash uses red and yellow colors, which are exactly the colors of his costume. While the picture of Green Lantern is, you’ve guessed it, green and black. (Photo by Michael Turner)

Shot by Bert Hardy, the black and white images show prisoners carrying out remedial tasks such as untying knots in post office string and sewing mail bags. Other intriguing shots show lags doing their daily one hour outdoor exercise, being frisked for contraband items by officers during a routine “rub down” and serving evening meals. Strangeways was designed by Alfred Waterhouse and cost £170,000 ($207,910) to build. The prison, famed for its prominent ventilation tower and imposing design, has become a local landmark. Here: A prison officer frisking prisoners during the “rub-down” at Strangeways Prison in Manchester, UK on November 1948. (Photo by Bert Hardy/Picture Post/Hulton Archive/Getty Images)

A Ukrainian serviceman is seen at his position on the front line in Krasnogorivka near Donetsk, Ukraine, August 12, 2016. (Photo by Gleb Garanich/Reuters)

A weapon is being destroyed during an exercise to disable seized weapons in Caracas, Venezuela August 17, 2016. (Photo by Marco Bello/Reuters)

A girl reacts during a rehearsal for the Independence Day military parade in central Kiev, Ukraine, August 19, 2016. (Photo by Valentyn Ogirenko/Reuters)