How do you make the AoS invincible blocks?

I know this isn't a hack but how do you do you make the invincible blocks? I know it's something like what's displayed in the image below, stacked on top of eachother but i've never watched someone make it. How is it done?

I know how to make it
But I don't trust people making this stuff(It's a glitch BTW)
People can troll with it and it messes the game really badly...
I might tell you

When other people have made them i've used them to try and make helpful structures, like bridges, to stop griefers from destroying bridges like on anticbridge and bridge wars. And i've seen the griefers get out of control on aos recently (especially on german spades server) so this would be helpful to dissuade them from griefing.