Kallax hack - the parts from a 2x2 and a 3x3 can be reconfigured to create two 2x3s. : r/ikeahacks
Jerome B. on Twitter: "The 3x2 and 3x1 #kallax... Don't look for them in your local #IKEA catalog... This is #ikeahacking at its best ! #fb http://t.co/JU8XfPrFWq" / Twitter
KALLAX Shelf unit, white, 30 3/8x30 3/8" - IKEA
KALLAX Regal, weiß, 147x147 cm - IKEA Deutschland
Cube Shelves Like Kallax for Sale in Irvine, CA - OfferUp