Ergonomic Thumb-Actuable Keyboard

A keyboard including:

• an inner thumb row including a plurality of inner thumb keys configured to be actuated by a thumb which includes a thumb carpometacarpal (CMC) joint, such that a critical contact point of each of the plurality of inner thumb keys is arranged along an inner thumb arc on an inner thumb key plane;
• and
• an outer thumb row including a plurality of outer thumb keys configured to be actuated by the thumb, a critical contact point of each of the plurality of outer thumb keys is arranged along an outer thumb arc on an outer thumb key plane, wherein the inner and outer thumb key planes are non-coplanar, such that, when the keyboard is in use, said inner and outer thumb key planes intersect with each other and a palm plane, where the palm plane is the plane upon which a user's palm lies when the keyboard is in use.