SciAm had an article on this about 20 years ago, which had the recognizable face down to about 6 blocks. You were instructed to get somebody else to hold the mag for you about 10 feet away to make it come good if you couldn't see it up close.<br /> <br /> It was fabbo!
George
I found an advertising image of this type on the side of a building in Harajuku back in 2002: <br> <img src="http://img407.imageshack.us/img407/3802/img02646yh.jpg"><br> <br> <a href="http://img407.imageshack.us/img407/3802/img02646yh.jpg">(http://img407.imageshack.us/img407/3802/img02646yh.jpg)</a>
Chris Kuan