Who is up for a stair workout? Well the minifigs in this picture are certainly getting their cardio in for today. Octagonal Staircase is brought to you by the extremely talented AC Pin, whose creations appear in our MOC of the week blog regularly. 

Although this seems like a simple MOC, especially for AC, the perfect placement of the stairs and the ability for the walls to close in and be widened show some great technique. 

And as always, we love that AC includes our accessories in his MOCs. The two knights are wearing Jousting Helmets with Jousting Plumes and Demon Armor. The minifig on the lower steps is carrying a Nauhe II Sword and the one on top is holding a Loop Javelin. 

Check out more of AC Pin's brilliant work on his Flickr page.