Say you want to move a two-dimensional shape — your sofa (disregarding its height) — through an L-shaped hallway ... Joseph Gerver of Rutgers University proposed a particularly clever curved shape ...

you have so many options — from the classic rectangle shape to L-shaped, curved, U-shaped, low-back, high-arm sofas, and more. To help you choose wisely, House Digest spoke exclusively with six ...

Gerver’s sofa looks identical to Hammersley’s, but it’s a much more complicated construction. Gerver stitched together 18 distinct curves to form his shape. On closer inspection you might ...