This is application of a color optical illusion. A black-and-white picture looks like a color picture!! Your picture turns into an optical illusion picture. A negative picture is displayed first. Please continue looking at the central guide point. 15 seconds later.The negative picture is switched to a black-and-white picture. But... The black-and-white picture looks like a color picture!! *Method to look well - Do not move position of your eyes and the screen. - Continue looking at the guide point after switching to a black-and-white picture. - Do not blink your eyes. You can get GIF animation. Let's share it on Web. This is samples. https://nekobukiya.com/colorfulmonotone/sample