Abstract: An input interface for an electronic device, comprises: a first directionally articulatable central element for pressure operation by a user to indicate one of a first plurality of inputs depending on a direction of application of pressure, and a first directionally articulatable surrounding element arranged at least partially concentrically about the first central element for pressure operation by a user to indicate one of a second plurality of inputs depending on a direction of application of pressure. A four button keyboard constructed from such elements provides a compact but full alphanumeric keyboard, and such elements may double as a cursor manipulation tool. A touchscreen version of the interface is also described, and vectors are used in place of tilting.