The silence was deafening

Bricks and mortar,  
I built them high,   
Layer after layer,  
Beyond the sky.   
 
Inside was cosy,  
With adequate room for one,   
No doors or windows,   
I made sure they were gone.   
 
For extra precaution,  
I constructed a moat,  
Surrounding my four walls,  
Ofcourse there's no boat.   
 
Still not satisfied,  
That my fortress would hold,  
I implemented one final precaution,   
To strengthen the mould.   
 
Anyone that came near,   
Would be driven away,   
Artful at self-destruction,  
Who would want to stay?  
 
So now I am secure,   
And all alone,   
To enjoy the overwhelming isolation,   
Sat on my throne.