because there is no restriction about the material of the sheet, it is possible to change the touch feeling with changing the material. It is very difficult to do such thing with touch screen.
Some experimental system of Variable Sheet have been realized and used. Currently, three kinds of pictures are drawn on the various sheets. They are piano-like keyboard, drums, and animals. Users can play a simple music with keyboard and make rhythm with drums. Furthermore, if users touch an animal on the sheet, there is a cry of the animal.
In order to evaluate the response time of the system, maximum number of sensing per minute is examined. At this moment, an old PC is used in the system. However, the system can sense about 120 times per minute without error. This response time will be improved with using a more modern PC.
Depends on the subjective evaluation of the users, the Variable Sheet is fun to use and most of them were interested in the system. However, the accuracy of the system is not so high, so some users recommended that the touch screen was better than Variable Sheet for the task which need accuracy. Anyway, from these experiments, Variable Sheet is available to use for entertainment purpose. Furthermore, if the requested accuracy is not so high, the Variable Sheet should be an attractive interface.
In this paper, a new kind of interface, named Variable Sheet interface, is introduced. Variable Sheet interface has so much flexibility that it is easy to make a new interaction with changing the pictures drawn on the sheet. Another application of Variable Sheet will be introduced and objective evaluations will be done in near future.
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