Two young children may not know each other\'s names, yet intuitively they understand what is most important in a friendship. After all, what is a best friend, if not someone who says \'la la la\' when you say \'la la la,\' and who laughs with you the whole entire day, especially when you pretend to be a pickle? This is a sweetly earnest, visually stunning celebration of the magic of friendship.\"(W) Julie Fogliano (A) Jillian Tamaki