The Conquest of Space

[Amit Dutta]

Nice sold work dude. Gotta ask though. Is there a reason you've drawn all the ellipses wrong in the ones where you've  used the squares in perspective to bound them? You seem to always be using one of the diagonals of the square as the major axis for every ellipse, rather than using the centre points of the sides of the square to draw the ellipse?  It seems intentional so just wondering.  
You seem to be doing closer to fig 15 and not 16+17 below.