Can't knit, need to riddle...

Yesterday the new KAL "The Da Vinci"-shawl started. You don't have to be in a group to get the clues but you need to use your brain to get the clues :-)
I already found out clues 1-4 but for some reason my brain is clogged when it comes to riddle 5 and 6 :-/
The site will be open until October 14th, so hurry up and get your hints as long as they are there:

The Da Vinci KAL

ravelry group (really helpful without spoiling the fun :-)