One of those projects is “Shanghai Dreaming, Holding an Urban Golden Card“, made for the Shanghai Biennale in 2008.

This work is a great example of an approach to public art, that involves the local public, it is created through the input and participation of the public, it uses various media, she used local businesses, for instance a marketing company, to communicate the work. I like very much how through the collecting of stories, and transforming them into a visual, physical manifestation, some residents of Shanghai, just everyday ordinary citizens become visible. And through their stories, in fact, a story about the social impact of city life emerges.
An interview with the artist about this project can be seen here:
http://www.dmovies.net/shanghai7/index.html

Consider this an example of how you could think about creating the monument for Nan Ting.

Jeanne van Heeswijk’s website: http://www.jeanneworks.net

In his work The 7 Lights, artist Paul Chan makes use of light and shadow, through digital projection.
“The Lights create a vast image of cyclical destruction and rebirth, spread across floors and walls like light falling through windows. Structured over the course of a day, each of the Lights begins peacefully, with the warm colors of dawn. Slowly the atmosphere changes: silhouettes of objects rise up through the air and are dismantled by obscure forces, while human shadows plummet towards the ground.”

http://www.newmuseum.org/paulchan/1stlight.html

For instance for the subjective mapping assignment this is an interesting example:

“Guangzhou Supports You!” works like this: the organizers supply a “Guangzhou Supports You!” graphic (see below) that serves as the essential element of the entire activity. Participants simply need to choose a corner, alley, place, space, etc. in Guangzhou, take a photo with the graphic appearing somewhere in the photo, and then upload the photo to the official “Guangzhou Supports You!” website to share their affection for Guangzhou with everyone – that’s it.

http://www.guangzhouchengni.com/

An interview with the initiatiors of this project can be found here:

english http://edge.neocha.com/interview-profile/interview-guangzhou-cheng-ni2-0/
中文 http://edge.neocha.com/zh/interview-profile/interview-guangzhou-cheng-ni2-0/

Graffiti Research Lab, is an art group dedicated to outfitting graffiti writers and artists with open source technologies for urban communication. The members of the group experiment in a lab and in the field to develop and test a range of experimental technologies. They document those efforts with video documentation and Do-It- Yourself instructions for each project and make it available for everybody.

source: Wikipedia
http://graffitiresearchlab.com/

Jenny Holzer (born 1950) is an American conceptual artist.(…) The main focus of her work is the use of words and ideas in public space. Originally utilizing street posters, LED signs became her most visible medium, though her diverse practice incorporates a wide array of media including bronze plaques, painted signs, stone benches and footstools, stickers, T-shirts, condoms, paintings, photographs, sound, video, light projection and the Internet.

source: Wikipedia
http://www.jennyholzer.com/

HOTEL was made in 2004 by Dutch artist Han Hoogerbrugge. I believe it is a very good example of how an online story can become a totally immersive experience.

You can explore the hotel and the story online at:
http://www.hoteloscartangoecholima.com/splash.html

Checkout their weblog here: http://www.yahplus.cn/blog/onlycity在里昂/
and their main website here: http://anyah.cn/
and a experimental work here: http://yahlab.com/

They’ve just come back from France where, together with artist Liu Qiangyuan, they created an online project called: Only City
About their city of the Eye:
“Only city.org is a city constructed on Google Earth (…)by Yah Lab. They named the Only City “the City of the Eye” in Chinese which implied the capital city/the Forbidden City. Moreover, in Chinese culture the eye is the finishing touch an artist makes his work alive, It is the crucial action that gives life to anything. (…) Liu’s [Qiangyuan] real size woodcut figurines reside in the Only City and become a reflection as well as storyteller(…)”

Using Google Earth (which you could definitely call public space) they’ve created and environment where people from all over the world can connect. Woodcut characters made by Liu Qiangyuan, mix with the virtual world of games and online environments. Here are some screenshots of the site. Click on the thumbnails for larger version:

Visit the site here: - http://onlycity.org/

Daan Roosegaarde is an artist working in Rotterdam, the Netherlands.His work explores the dynamic relation between architecture, people and e-culture. In this interaction his sculptures create a situation of ‘tactile high-tech’ where visitor and (public) space become one.

Roosegaarde: “My artworks explore the dynamic relation between architecture, people and new media. In this research the sculptures are a materialized collision of technology and the human body. Through the use of new media the sculptures trigger human senses to make a sensual engagement with their environment. For example interactive landscape Dune enhances the daily behavior of people, reacting to their sound and motion as they pass by in the evening. Here the visitor changes into a participant; a direct influence on the identity of the interactive work. Fused into an intelligent and sensible environment, the artwork becomes an extension of our collective, social skin.”
Visit his site here: http://www.studioroosegaarde.net/

Giny Vos‘ work is characterized by a poetic use of technology. It is mostly “created for public spaces.  This means that, by and large, the real existing environment plays a significant role in the final result. (…) I consider the processes that take place at any given location to be just as important as the physical characteristics thereof, so I often make use of movement, in the form of light or digital displays. At the same time, the work also always tells its own story; it is not an illustration of the place where it is, but rather tries to expand the experience of this. In this way, the work seeks to place the given situation (literally and figuratively) in another light, whereby a new situation arises, without the existing one being obscured.”
Visit her site here: http://www.ginyvos.nl/site/reizendzand_eng.html