How many colours do YOU see? Strange optical illusion divides the internet

Twitter users are hotly debating how many different shades the image shows, with some seeing 11 and 14 and one user even saying they can see 17 shades. https://www.dailymail.co.uk/sciencetech/article-9244619/How-colours-Strange-optical-illusion-divides-internet.html?ns_mchannel=rss&ns_campaign=1490&ito=1490