---
title: vi.lilac.chaser()
subtitle: "Visual Illusions: Lilac Chaser"
date: '2017-04-04'
slug: vi-lilac.chaser
from_Rmd: yes
---

Stare at the center cross for a few (say 30) seconds to experience the
phenomena of the illusion.

Just try it out.
 

```r
library(animation)
ani.options(interval = 0.05, nmax = 20)
par(pty = "s")
vi.lilac.chaser()
```

<video controls loop autoplay><source src="https://assets.yihui.org/figures/animation/example/vi-lilac-chaser/demo-a.mp4" /><p>plot of chunk demo-a</p></video>
