in synthetic sensory information so that the operator can react with the
external environment in a manner more similar to direct contact. A mech-
anical form of tactile feedback delivery occurs when an operator types on a
keyboard. Note that the surface of the keys is slightly beveled to accommo-
date the curvature of the fingertips. The keys are spaced so that an operator
can feel the edges. As a result, some errors can be corrected when the oper-
ator notices that a keystroke did not feel correct. This is an important source
of feedback because expert typists do not need to looks at the keyboard
when ...
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