This article has just about made my day:
Who knew? Ikea EKBY RISET brackets are designed to lock at whatever angle you like so make a great storage solution for your slanted walls and ceilings.
You know these slanted walls and ceilings. These are the slanted walls and ceilings that silently mock you as you try to shop for bookshelves, cabinets, shelving units, or pretty much ANY piece of normal furniture that is built with right angles.
I can’t wait to install some of these shelves on my smug, slanty, formerly useless wall spaces. I think my love/hate relationship with Ikea is being rekindled…