We all have a pretty good understanding about our three dimensions. First starting off with 0D or a point in space = 360º. Then 1D being a line = 180º. Moving to 2D such as a square = 90º. Finally ending with 3D = 45º. It is important to state that finding these angles requires the viewer to be looking from a perfect bird's eye view to the center of each dimension. An interesting yet very simple pattern emerges while doing this being the next dimension in this infinite series is just 1/2 the last. With this statement we can easily find what 4D square angle would be from a perfect bird's eye view which would be 45º/2 = 22.5º. Drawing a 4 dimensional square is a little tricky but I've managed to map one out. I don't particularly know any use or further meaning this might hold, but any information would be wonderful.