(or if he was asking about art and games in the street ^^)
I was looking for pictures to illustrate my thinking and I got carried on...
<img src="http://pixdaus.com/pics/cIH5xYJdWYPjLtxh5y.jpg">
<img src="http://zedomax.com/blog/wp-content/uploads/2008/01/human_tetris.jpg">
<img src="http://technabob.com/blog/wp-content/uploads/2009/05/tb-gtejsa1.jpg">
<img src="http://3.bp.blogspot.com/_1CNIPqLjSyg/SLK4cpYUjPI/AAAAAAAABuY/zYW7FABIqe8/s400/bnf-tetris-medium.jpg">
<img src="http://paintitbeige.files.wordpress.com/2009/07/18941w_polish_12.jpg?w=512&h=364">
Classic games are used by artists as a culture pivot or a theme to make a point (space invaders, tetris, mario NES, ...) and these games are often use as proof of concept to test new expression media... or just to give a retro feeling, but I'm not sure at which point the line is crossed between a game and an art piece... and I still wonder if there is a line to be crossed.
<img src="http://www.iart.ch/iart_new/wp-content/uploads/diagonal.jpg">
<img src="http://www.treehugger.com/rAndom-International-OLED.jpg">
Once there is a goal set and a constraint to challenge, isn't everything a game, including art?