The quiz was about using recursion to create shapes (koch.)
(It's better to explain with a picture.)
By the way, (koch 0) is just a horizontal line.
(koch 1) takes the line, the same line rotated 60 degrees counter-clockwise, the same line rotated 60 degrees clockwise and the same line again.
(koch 2) does the same thing, but instead of the same horizontal line, it uses koch 1.
Spiral took a vertical line and turned it towards the centre depending on the number that is entered as a variable. For example, (spiral 3) would have a vertical line and it turned towards the centre 3 times.
Palindrome basically took a word and mirrored it. For example, (palindrome "silly") would get me "sillyllis."