Remembering 9/11

Inference:  The architects deliberately built a glass window for viewing reasons.

Evidence:  

• Glass enclosure will be located at the height of former World Trait Center Tower 1.
• 1,368 feet of glass (which is pretty huge!)

Explanation:  

•  On the new model, the 1,368 foot glass window might be there to watch for suspicious activity happening in the air.
•  Also, people might want to look at the view of the city.
•  Maybe to commemorate where The Twin Towers were standing.

Concluding Sentence: The glass structure was made for multiple purposes including precaution
                                     and commemoration.