Racing Club's Estadio Presidente Perón in Argentina isn't a place to turn up dressed in red. Racing wear blue, while red is the colour of arch enemies Independiente, who are based in the same Buenos Aires suburb of Avellaneda. But Coca-cola has found a cheeky way to sneak its brand colours into the stadium We've pointed out before the popular Coca-Cola optical illusion that's being going around for years on social media. The images appear to show a familiar red coke can but actually contain only the colours blue and grey. Now the mind-bending illusion has crossed over from TikTok to the terraces. Racing fans were seeing red, but Coca-Cola's optical illusion ad is all blue, white and grey (Image credit: Coca-Cola / WPP Open X) The marketing agency WPP Open X, alongside VML and Grey, picked up on the Coca-Cola illusion and used it to sneak the brand's colours into stadiums in where red is an anathema – the ads were also displayed at Arena do Grêmio in Brazil.…