How to create relative symbolic link in mac OS?

I think, you have the order of the arguments backwards. It should be:

$ ln -s <dest> <link>

Where <dest> becomes the contents of the new link created.

In your specific example:

$ cd "folder 1"/"folder 2"
$ ln -s ../../Original Original

Or, in one command, from base directory:

$ ln -s Original "folder 1/folder 2/Original"

take out the first / - thats an absolute link from root, you want ../../ to be relative from current location.