SOD !!!

According to the internet, to have a Sod roof, this is how you do it...

Really?

Do you actually believe all those old buildings in Scandinavia have all that on the roof? 

Looking at the photo below, it looks less complicated...

As for myself I like the idea for keeping aerial surveillance at it's minimum... 
The Rock and Tree look is particularly cool. 

but...what about bugs and critters?