# Comment posted to https://www.youtube.com/watch?v=Z8LvkbGSXNw
# by @megalithhunter

@ IIUC, some of the round structures at Göbekli Tepe were rebuilt once or twice, each time with smaller size and with the floor level higher than the previous one. Not what one would expect from a temple, but would make sense if the water was becoming more scarce.  

Presumably at some point the water source dried up, so the spare was reused for a while but eventually the whole village was abandoned.  In the rebuilding, pillars and other elements were moved and reused as slabs for the benches or just landfill. 

It is not clear when the big central pillars were erected, but they cannot stand up at lowest floor level (the floor currently exposed by the dig), so they probably were put there during one of the reformations, when the room was partly filled with rubble to make a new floor. 

The pillars are not "beautifully carved". It is quite evident that they were originally conceived and created as plain geometric T-shapes. The carvings are later additions, and we can't tell whether it was weeks later or millennia later.