At this website you can see different examples of the Uniformity Illusion. Peripheral stimuli seem to take on the identity of stimuli at the centre of the screen.

More information: Otten, Pinto, Paffen, Seth & Kanai (in press). The Uniformity Illusion: Central stimuli can determine peripheral perception. Psychological Science

This illusion works best when, after you open an example video:
1) make it full screen
2) sit at a distance of 30-50 centimeters
3) keep your eyes fixated at the centre of the screen for a prolonged period of time (varies per illusion and person how long, but generally several tens of seconds)
4) try to not blink (or at least not blink too much)

To try an illusion click on the category on top, or on the right hand side.

On the top of each page, you will find a short description of the options. The first examples are always without fixation spot (this seems to work somewhat better for most people), below that are the same examples with a flickering fixation spot, which may help you keep fixation on the centre.

Note that perceiving the illusion requires some practicing. After all, it is not very usual to fixate your gaze at one point for a long period of time, without blinking. Note also that the examples on this website are chosen so that you can actually see the image change in front of you. This is because the differences between centre and periphery are relatively large. With smaller differences, the centre can overflow the periphery faster or even instantaneously.

The site is arranged in such a way that you can pick the easier to see illusions, or the ones that are more difficult to see, but are sometimes more spectacular. For most people the first 6 are easier to see (blurriness --> size illusions). Starting from conjunction, the illusions may require more practicing, but the resulting illusion can be more surprising.
Also note that not all illusions need to be fullscreen to be experienced, some may already work by simply looking at the centre of the images at the side bar.