Hello I'm new and am hung up on why this won't work


rectPos rect01;


void setup(){
 size(200,200);
 background(150);
rect01 = new rectPos(width/2, height/2, 50, 60);
}

void draw(){
 
 rect01.show();
 
 if(rect01.count<3){
 rect01.update();
 }
}
 
 class rectPos{
   int x;
   int y;
   int sizeX;
   int sizeY;
   int count=1;
   
   rectPos(int _x, int _y, int _sizeX, int _sizeY){
     x=_x;
     y=_y;
     sizeX=_sizeX;
     sizeY=_sizeY;
     
   }
   
   void update(){
     x=x/2;
     y=y/2;
     sizeX=sizeX/2;
     sizeY=sizeY/2;
     count++;
   }
   
   void show(){
     rectDraw.display(x,y,sizeX,sizeY);
   }
 }
 
 class rectDraw extends rectPos{
   int $x;
   int $y;
   int $sizeX;
   int $sizeY;
   
   display(float _x,float _y,float _sizeX,float sizeY){
     $x=_x;
     $y=_y;
     $sizeX=_sizeX;
     $sizeY=_sizeY;
     rect($x,$y,$sizeX,$sizeY);
   }
 }

The error message reads "The method "display" is not static, and cannot be accessed in this static context."
I realize there are a number of ways around this, but am wondering why this wouldn't work and what it means for a method to be static.

thanks for the time

thanks, that was super quick