ridges have two shapes, they are either straight, as in the
key O, or angled, as in the key P. An angled ridge signals
to the finger that the key is a "corner" key. A
straight ridge on the top edge of the key signals to the finger
that the key is located on the top row. A straight ridge on
the bottom edge of the key signals to the finger that the
key is on the bottom row.
The Ridges Form a Box
The ridges on the keys are organised so that they form a virtual
There are two alphabetical boxes, one formed by the keys Q-R-V-Z
in which the left hand moves, a second one formed by the keys
U-P-?-M in which the right hand moves. There is also a numerical
box formed by the keys 1-7-9-3 on the numerical keypad.
The two alphabetical boxes comprise three rows of keys, the
home row, the row above it and the row below it. Each row
comprises four keys, one for each finger. The ridges on the
keys are engineered to feel like tiny "walls" and
because they are organised in a simple geometric pattern,
they are easy to understand, learn and remember.