function BlobCollective(x, y, startNum, maxNum)
    {
      this.maxNum = maxNum;
      this.numActive = 1; 
      this.blobs = new Array(); 
      this.tmpForce = new Vector(0.0, 0.0); 
      this.selectedBlob = null; 
      
      this.blobs[0] = new Blob(x, y, 0.4, 8);