I’m a latecomer to the KALLAX system from IKEA. I originally dismissed their cubic shelves as inverse-Goldilocks furniture: too small for most things, but too big for small trinkets. But I consider myself a convert since getting one for our TV cabinet: the cubbies are perfect for all the ancillary stuff we have around the TV, such as cables, controllers, power boards, Ethernet switches, and Arrietty. There are three things with which you can extend a KALLAX: Nothing, meaning you use it as a...