Merge pull request #3153 from programminghistorian/Issue-3152

Update creating-mobile-augmented-reality-experiences-in-unity.md

en/lessons/creating-mobile-augmented-reality-experiences-in-unity.md

@@ -56,7 +56,7 @@ Novel applications of AR continue to surface  within a variety of industries: [m
 
 {% include figure.html filename="ar-dev-1.png" caption="Augmented reality can be used to overlay digital information onto existing texts such as historical markers. This modified image is based on a photograph by Nicholas Henderson. 2015." %}
 
-Since at least 2010, [digital artists](https://manifestarblog.wordpress.com/about/) have been creating AR applications for social advocacy and cultural intervention. For example, Tamiko Thiel's AR project [Clouding Green](http://www.tamikothiel.com/AR/clouding-green.html) reveals the carbon footprint of specific technology companies. More recently, a group of New York artists created a ["vandalized" version of Jeff Koon's Snapchat sculptures](https://techcrunch.com/2017/10/08/jeff-koons-augmented-reality-snapchat-artwork-gets-vandalized/) as a way of protesting the digital takeover of public AR spaces.
+Since at least 2010, [digital artists](https://manifestarblog.wordpress.com/about/) have been creating AR applications for social advocacy and cultural intervention. For example, Tamiko Thiel's AR project [Clouding Green](https://perma.cc/6NLX-AJBH) reveals the carbon footprint of specific technology companies. More recently, a group of New York artists created a ["vandalized" version of Jeff Koon's Snapchat sculptures](https://techcrunch.com/2017/10/08/jeff-koons-augmented-reality-snapchat-artwork-gets-vandalized/) as a way of protesting the digital takeover of public AR spaces.
 
 At the [Trace Initiative](http://web.archive.org/web/20180421163517/http://english.ufl.edu/trace_arcs/), a digital humanities organization in the University of Florida English Department, we seek to build upon the work of these artists by promoting the creation and circulation of humanities-focused mobile AR applications. We released our first AR application [to the Google Play store](https://web.archive.org/web/20210421123810/http://trace-arcs.english.ufl.edu/projects/scramble.html) in spring 2016.