A tangent graph looks (kinda) like:
Code:
 |    |    |    |    |    |    |
/    /    /    /    /    /    /
----|----|----|----|----|----|----
   /    /    /    /    /    /    /
  |    |    |    |    |    |    |
Yeh? But the top of one line never meets the bottom of the next...

What about if you took the graph, wrapped it around the outside of a cylinder with an infinate diameter... would the tops and bottoms meet?