Ok. Let me share with you my recent artwork. An amazing experience that has come from studying a Chinese cultural and their approach to life through observing a nature that resulted in many of theirs tools. One of them is their astrology- worth to study! Extremely interesting topic and study case! That can be useful in our lives. Well that is topic not for now- what I have done, was turning this study Into an artwork.and where I started to sense problems, was- when I supposed to tilt a perfect cube in perspective that I made. Well! Not the difficult first part: one vanishing point stays the same. In this case- on demonstration below- what I mean. Other sets of lines going to an opposite side on the horizon line is also not difficult to determine- just very simple- how much I want to have a new cube tilted. No problem. But! What is going to happen with last set of lines? Those who are going down? Is it 45 degree? 52 degree? Where is that vp? In relationship to the rest of the vanishing points? You may say- use 3d program. Yeah, sure! But for know- I want to understand. Is there any measuring method that can be applied? Thank you very much.