Problem + Position = Purpose

Defining ornament may be an important step but it did not progress my thoughts much further.  
What aspects of ornament am I referring to?  What is it that should be changed?

PURPOSE

I have two problems:

1) With regards to ornament, contemporary architecture has difficulty designing in three dimensions.  Scaled up too large, the ornament becomes the building itself: an icon (duck).  On the other hand, a smaller ornament is usually repeated as a two-dimensional pattern that simply screens the building (decorated shed).  

> Contemporary architecture should be designed with the aggregation of an ornamental module.

2) Recent architectural projects that employ ornament fail to utilize its ability to communicate. (a decorated shed with an empty sign)

> Contemporary architecture should use ornament as was traditionally done: to explain the structures they adorn.

(In this case, ornament does not 'adorn' architecture but will form its very being per position 1) above)

226 National Stadium by Herzog & de Meuron 

While ornamental in nature, the structure is identified not by its parts but the sum: a giant bird's nest.

Ravensbourne College by Foreign Office Architects

An ornamental pattern covering a nondescript form.  Does not indicate the program or context.