Okay, maybe it's more of a cylinder... and it's not a perfect circle. It is however very creative and shows the extent of things that you can do with LEGO bricks. You aren't forced to just put things into sharp 90 degree angles all the time. There are a ton of ways that you can stack LEGO bricks together and you can even use them to make a round-ish object.
Full disclaimer... this isn't my original idea. I'm not sure who can claim the initial win for building a circular shape with bricks. So here's the question... how else can you do it and with what pieces? What if you wanted to make a curved wall with 1 x 4 bricks or 1 x 6 bricks?
An update on the business... I have another job and sadly I don't play with LEGO sets all day. That other job has kept me involved over the past few months, but I'm still expecting to be back to bricks in the fall. I also have some new sets that I need to dig into. I ordered set 21302: The Big Bang Theory (Brickset review here). I also ordered some of the second series of Simpsons Minifigures (and should have some available for sale in the fall too. Thanks for your patience. I will continue to post as I get new things to show, but won't be able to sell again until the fall.