Need a good Motion Sensor

I am trying to make an interactive sculpture where I place sensors on 4-5 different objects, so when they are moved, touched, or picked up they digger a sound. Any suggestions? There are so many sensors it is hard to know where to start. Thanks.

A 3-axis accelerometer would register any motion of an object. You would just analogRead() the X, Y, Z outputs and watch for any changes in the reading.

With respect to "touch" you can measure changes in capacitance. The object would need to be conductive however.