In this paper we propose an interaction technique using onomatopoeia. Although onomatopoeia, imitative words such as ‘Kira Kira’ and ‘Moko Moko’, is frequently used in ordinary conversation, many articles and comics, it is rarely used for human-computer interaction. We consider that onomatopoeia helps users to tell emotions and sensuous information to a computer more effectively. We developed a prototype of painting system called Onomatopen, which enables a user to change brushes by saying onomatopoeia. For example, when the user draws a line while saying ‘Giza Giza’, a jaggy line is drawn. As a result of our user test, we found that users can easily understand the usage and enjoy drawing more than conventional painting software.
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