When you use a product or service every day, even a small change to it can make a huge difference. This week, Apple introduced the latest version of its macOS operating system, and it brought some considerable changes. Even more jarring, however, is Instagram's new dark mode in iOS. This week, Instagrammers opened up their beloved app to find the glowing white interface had gone black. Personally, I immediately hated it, but now I'm already used to it and will complain again next time it changes.