Move in close and see what happens!

Here are the official Fields and Events, for the ProximitySensor node in the VRML text, according to the VRML2 Spec:
 ProximitySensor {
  exposedField SFVec3f    center      0 0 0
  exposedField SFVec3f    size        0 0 0
  exposedField SFBool     enabled     TRUE
  eventOut     SFBool     isActive
  eventOut     SFVec3f    position_changed
  eventOut     SFRotation orientation_changed
  eventOut     SFTime     enterTime
  eventOut     SFTime     exitTime

------->>> the source for the .wrl file!