https://webarchive.loc.gov/all/20020911124353/http://www.spot.com/home/news/nyc-091101.jpg
https://www.globalsecurity.org/eye/wtc-imagery.htm
There are 11 signatures that are 11 layers of 9/11
The count of each signature repetition in the qposts leads to a clue of that solution.
{some I have solved, others I haven't been able to find yet}
Related to each signature is the 'beginning post' and 'last post' delta of the time stamps. {which lead to future events when connected to other q posts that are related}
The delta values that turn up in the one solution we found is
Years-Months-Days
Which is what the astronomical clock picture shows 2 clock faces
https://www.prague.eu/en/object/places/3129/astronomical-clock