The yellow one.
I made Cub a fleece blanket — two pieces of fleece fabric, one with a monster pattern, tied together in knots all around– for his first birthday. (It’s his favorite lovey, even over his stuffed monkey, Uncle Ted.)
Among all the multi-color tassels around his blanket, he likes a yellow one in particular. A skinny, stretched out, much-pulled-and-loved tassel. I’m not sure how or why he chose that one, but it’s his special “yeyyo one?”
He sucks his thumb, finds the yellow tassel, and tickles it in his ear or rubs it on his face.