We can use the HMDs to overlay some sort of 3d model, whether it be in first person or just showing a 3d model floating before the user. This way, the user can get real-time visual feedback as he naturally moves his head. Because the head is probably not going to remain still while dancing, this allows the user to constantly receive feedback without interrupting the dance. If feedback was given on a separate monitor, it would interrupt the dancing for the user to look at the screen.
We could use the eye tracker to determine which direction the user is looking to give feedback or keep the user from being distracted.
The vibrating gloves can be used in a variety of ways. They could vibrate when the user needs to do something, like grab his partner or perform a specific move.
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I also have a few ethnography suggestions for the undergrad CHI class.
First of all, they could scan through a list if student groups on campus and pick one that looks interesting. They could then attend a meeting (with permission if required, but hopefully anonymously) and observe the group.
Another possibility lies in the on-campus parking lots. The students could find a good vantage point to see a large portion of a particular lot (such as lot 50 since it is large and full during the days) and observe drivers' behaviors.
Similarly, they could watch the crosswalks to observe the students' behaviors in that situation.
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