Does a viewer understand the purpose of the post?
The viewer understands like they do with the sans serif design. The viewer can tell that this is a composition made of numbers and letters, with a focal point, depth and movement.
Does the post have an obvious hierarchy?
The hierachy may not be as obvious in this composition, but I would say the first point is the upsidedown 2, next the 9, and finally the line pointing off the Q.
Does the post attempt to engage the viewer?
The design does engage the viewer, with movement, depth and focal point. Movement, because the curved lines guide the viewer's eyes around the page. Depth because the layers of white and black decreasing in size creates an effect like looking through a papertowel roll, the smaller the objects get the farther away they appear. Focal point, is obviously the upsidedown 2, it is important because it is different than the rest of the letters/numbers.