It Makes a Difference to the Sheep

It's a mathematical equivalent of the classic card-force trick, isn't it? I've noticed that when you reload the page, you get different symbols for each number--but all the other symbols are just smoke and mirrors. The "card force" here is, regardless of what two-digit number you choose, the product is always going to be some multiple of 9. Therefore all the multiples of 9 in the table on the right should have the same symbol attached to them, and unless you do the math wrong, that's the symbol that will show up in the crystal.
 

You got it. Of course it took me several tries before I figured it out.