Architecture graduate Sean Riley has designed a curvy cutting knife to spare architects from the hand cramps, bruising and sore knuckles endured while making models.
Described by Riley as the "perfect extension" of the hand, the ErgoKiwi tool features a dip on the underside for the thumb to slot into, and a curved top that provides a resting spot for the forefinger.

Riley came up with the curvilinear design while studying at Boston Architectural College, where he found that standard cutting knifes ? which typically have hard, cylindrical handles ? caused bruises and strain when used for model-making over long periods.
He also noticed that many of his peers were altering their implements with extra cushioning like electrical tape.
"My studio required immense amounts of study models that had to be made by hand," Riley told Dezeen. "After spending hundreds of hours using pen knives and having some of the worst hand cramps, I started thinking about how I could improve work flow."
"I started designing a handle that tackled the biggest problem: hyper-extending knuckle joints, that's where the most pain was coming from," he continued. "Prolonged pressure on a single joint becomes unbearable, so that was where I started."

The Boston-based graduate spent two years developing hundreds of versions of a handle, testing each with designers and architects, and then refining to create a product that is "as simple and easy to use a...