Yifa didn't see Mera, or at least not enough of her to recognize it as her.  Mera could see her, though she was at the wrong angle to see what Yifa was buying for her.  And even if she had, there was no way of knowing that the piece bought was for<em>her</em>and not for Yifa.<br/><br/>"Ah, yes, there is a place I can recommend to you," the merchant told her.  "It's a short distance from here," he pointed in a direction.  "Look for the Artisan's Square, you'll find performers of all kinds there that you can watch for entertainment."