int i=1000;
stroke(128);
boolean aij;
size(250,250);
//was size(800,600);
for (int x=0;x<100;x++){
    int j=0;
    for (int y=0;y<100;y++){
  
        //aij = (i-j)%2<1? true  : false;
        //miniruit
        
        //aij = (i-j)%4<2? true  : false;
        //aij = (i-j)%6<3? true  : false;
        //aij = (i-j)%8<4? true  : false;
        //aij = (i-j)%2<1? i%12<6  : j%12<6;
        //schuine strepen
    
        //aij = (i-j)%2<1? i%4<2  : j%4<2;
        //aij = (i-j)%2<1? i%6<3  : j%6<3;
        //aij = (i-j)%2<1? i%8<4  : j%8<4;
        //aij = (i-j)%2<1? i%12<6  : j%12<6;
        //koksruiten 
        
        //aij = (i-j)%2<1? i%4<2  : j%4<2;
        //molenwiek
        
        //aij = (i-j)%4<2? i%8<4  : j%8<4;
        //aij = (i-j)%6<3? i%12<6 : j%12<6;
        //aij = (i-j)%8<4? i%16<8 : j%16<8;
        //aij = (i-j)%12<6? i%24<12 : j%24<12;
        //pied de poules

        //aij = (i-j)%4<2? i%2<1  : j%2<1;
        //aij = (i-j)%8<4? i%2<1  : j%2<1;
        //aij = (i-j)%12<6? i%2<1 : j%2<1;
        //aij = (i-j)%16<8? i%2<1  : j%2<1;
        //visgraten van oplopende lengte
        
        //aij = (i-j)%8<4? i%4<2  : j%4<2;
        //aij = (i-j)%16<8? i%4<2  : j%4<2;
        //idem maar dubbele dikte
        
        //aij = (i-j)%12<6? i%6<3 : j%6<3;
        //idem driedubbele dikte
       
        int c=10000;
        aij = i%4<2?  (i+j)%4 < 2 : (c+j-i)%4 < 2;
        aij = i%8<4?  (i+j)%4 < 2 : (c+j-i)%4 < 2;
        aij = i%16<8? (i+j)%4 < 2 : (c+j-i)%4 < 2;
        //aij = i%32<16?(i+j)%4 < 2 : (c+j-i)%4 < 2;
        //spitskepers   
        
        //aij = (i)%16<8 != (j)%16<8 ? (i+j)%4 >= 2 : (c+j-i)%4 < 2;
        //bijna kraanoog
        
        //aij = i%4<2?  (i+j)%4 < 2 : (i-j)%4 < 2; 
        //aij = i%8<4?  (i+j)%4 < 2 : (i-j)%4 < 2; 
        //aij = i%16<8?  (i+j)%4 < 2 : (i-j)%4 < 2; 
        //aij = i%32<16?  (i+j)%4 < 2 : (i-j)%4 < 2; 
        //was: rechtvandraad visgraten van oplopende graatlengte
        //lijkt op spitskepers maar anders
        
        fill(255*int(aij));
        rect(10*x,10*y,10,10);
        j++;
    }
    i++;
}