After I tried WiiMote Whiteboard, I think that it might be too hard for the visitor, who came in the gallery at the first time and had no experience at all. It might be too hard for them to learn how to interact by IR pen and control everything.
So I did some more research, trying to find anything else that works with Mac. There's still only a few.
DarwiinRemote is a software that allows you to use a Wii Remote as a mouse. What I learn from this software is I can use two candles as a censor bar!! It's a big save to me. I feel like I already spent too much money for my thesis now.
Here is my first test. It was more smoother than when I used IR pen in WiiMote Whiteboard.