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. http://en.nekobukiya.com/colorfulmonotone/sample