- numerical codes as characters -

There is a list of most common HTTP codes and their meanings:

Informational

100 Continue 

Success

200 OK 

Redirection

300 Multiple Choices 

301 Moved Permanently 

302 Found 

304 Not Modified 

Client Error

400 Bad Request 

401 Unauthorized 

403 Forbidden 

404 Not Found 

410 Gone 

Server Error

500 Internal Server Error  

501 Not Implemented 

503 Service Unavailable 

According to Google’s search statistics, HTTP error 500 is more than twice as common as 404 errors:

Darko Fritz uses some of less common codes to produce metaphor of human or urban situations. Code 302 is a special case, an example of industry practice contradicting the standard HTTP/1.0 specification, which required the client to perform a temporary redirect (the original describing phrase was "Moved Temporarily"), now the meaning of code changed to - 302 Found. 

In their video "trinity rgb", milica lapcevic and vladimir sojat use numbers to present and quantify rgb signal. This is personification of color white: 

             

Khlebnikov's poem "Numbers" ["Chisla"] (1911) treats numbers not as digits or a system for counting but organic beings.

I see right through you, Numbers.
I see you dressed in animals, their skins,
coolly propped against uprooted oaks.
You offer us a gift: unity between the snaky movement
of the backbone of the universe and Libra dancing
overhead. You help us to see centuries in a flash
of laughing teeth. See my wisdom-wizened eyes
opening to recognize
what my I
will be
when its dividend is one.

Numbers move, numbers think, numbers dictate. From a semantic point of view, one could say that these numbers here lost their denotative meaning. 

ASCII art uses characters to produce image. If we want to create image of character in ASCII, what we got is character depicted with characters.

                                     character(s) in motion