Comment: In MemoriamSome of you may have met Linda O'Toole at a Kyma immersion weekend in Champaign, at the 2004 NIME conference in Shizuoka, or in the San Francisco Bay area where she worked on improving the user's experience of hardware and software (from embedded systems to enterprise software installations) for such companies as IBM, Parc Place Systems (developers of Smalltalk), Digital Tools, Prism Solutions, Silicon Graphics, Acta Technology and Business Objects. But music was her first love. She had a PhD in experimental psychology with an emphasis on music perception and cognition and was interested in the psychological experience of music and its relationship to the way the human auditory system functions. One aspect of her research in musical instrument design was to design instruments whose function was based on the ways people see and hear. At the time of her death on April 8, 2005, she was working on the prototype of an elegant spiral instrument based on the psychoacoustical theory of pitch perception as a spiral in which octaves are directly above one another.