1#2#3 is a single tuple of three elements?

[Terrence Brannon]

Re: http://www.mozart-oz.org/documentation/tutorial/node3.html#chapter.basics

I've been staring at this sentence for 10 minutes, trying to simply
accept what it says, but it just does not make any sense to me:

   observe that 1#2#3 is a single tuple of three elements

But to my way of thinking, # is a binary operator and regardless of
associativity, it first creates a 2-tuple of two values and then
another 2-tuple nesting the first 2-tuple and the remaining element.

I really dont see how # could operate any other way, but would
appreciate any feedback on how this is possible.