8.10.3 Can you answer these questions?

8.10.3.1 How to make this figure of intersecting planes in asymptote or tikz?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=633002

I want to draw the following figure 
available here: 
http://mathandmultimedia.com/2011/05/25/intersection-of-planes-google-sketchup/ 
I found a figure similar to the last figure here: 
https://asymptote.... 
[asymptote]
 

asked by S. Venkataraman https://tex.stackexchange.com/landing/r/digest?cta=user&id=142225 Score of 1

8.10.3.2 How to make a number spirale front cover to a book?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=632720

UPDATE: I'm currently rewriting a new edition with my math teacher's self-published maths textbook. I have looked online for similar problems with number spirals cover but couldn't find anything ... 
[pgfmath] [covers] [bookcover]
 

asked by JokingGold0 https://tex.stackexchange.com/landing/r/digest?cta=user&id=262020 Score of 1

8.10.3.3 An alternative to tcolorbox - how to specify vertical skips?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=632973

EDIT This question was edited and made more precise. 
Background 
This is a question related to my other one. In a desperate effort made to avoid some of tcolorbox pitfalls described there, I have ... 
[tikz-pgf] [footnotes] [tcolorbox] [tikzmark] [glue]
 

asked by Radek https://tex.stackexchange.com/landing/r/digest?cta=user&id=92705 Score of 1