DEF Bubble1 PositionInterpolator{
    key[0, 10]
    keyValue[0 0 0, 0 2.0 0]
}

DEF Bubble2 PositionInterpolator{
    key[0, 0.1, 10]
    keyValue[0 0 0, -0.6 0 0, -0.6 -2.0 0]
}

DEF Bubble3 PositionInterpolator{
    key[0, 0.2, 10]
    keyValue[0 0 0, -1.2 0 0, -1.2 -1.0 0]
}

DEF Bubble4 PositionInterpolator{
    key[0, 0.3, 10]
    keyValue[0 0 0, -1.8 0 0, -1.8 1.0 0]
}

DEF Bubble5 PositionInterpolator{
    key[0, 0.4, 10]
    keyValue[0 0 0, -2.4 0 0, -2.4 0.5 0]
}