New calculator interface

[Liam Hays]

I highly doubt the circular group keyboard will be the next Big Thing in calculators. Even so, I like that the authors didn't just throw out an idea and call it superior---they took the time to find an optimal design and prove its characteristics.

Also, where would the ENTER key go, assuming the layout could be converted to RPN/RPL? Replacing that little = key in the lower right doesn't seem like the best option. Maybe if the ON key served double duty as both ON and ENTER?