When teaching my circular knitting classes, I often illustrate how not to join a round by twisting a strip of paper before joining the ends.  This demonstration reminds me of the construction-paper chains I made in kindergarten.  … These memories started me wondering if a chain could be knit.  What would happen if you placed one tip of a circular needle through the center of a knit tube and then joined the round - would the needle or yarn get stuck, or would the yarn ball have to be constantly pulled through the center?  I was surprised to find it worked without a hitch.  -- description from Loop-d-Loop, pg. 17 (pattern on pg. 35)