diff --git a/categories/img/mp/graph.mp b/categories/img/mp/graph.mp
index af82dd2..954f33b 100644
--- a/categories/img/mp/graph.mp
+++ b/categories/img/mp/graph.mp
@@ -25,7 +25,14 @@ green        :=(0.52156862745098  ,0.6              ,0.0);
 %%%%%%%%%%%%%%%%%%%%
 u:=.5cm; % unity
 gu:=5u;  % distance between states
-nodesize := 1.2u; %size of a node
+nodesize := u + .1cm; %size of a node
+
+def resize(expr nu)=
+    u:=nu;
+    gu:=5u;  % distance between states
+    nodesize := u; %size of a node
+    nodespace := u+.1cm; %size of a node
+enddef;
 
 % return the middle of a path
 vardef midpoint(expr p)=
@@ -91,7 +98,7 @@ vardef edgeFull(expr posA,posB,inan,outan) =
     path sub;
     path s;
     s := posA {dir inan} .. {dir outan} posB ;
-    sub := shorten(s,nodesize);
+    sub := shorten(s,nodespace);
     sub
 enddef;
 
@@ -138,16 +145,22 @@ enddef;
 %%           LOOPS              %%
 %%                              %%
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+vardef dist(expr a,b)=
+    numeric width,height,res;
+    width:=xpart b - xpart a;
+    height:=ypart b - ypart a;
+    res:=sqrt(width*width + height*height);
+enddef;
 % return a loop
 vardef loopFull(expr a,b,an) =
     pair ba,ea;
     path circ,p,s;
     p:=a{1,1}..b..{1,-1}cycle;
-    circ:= fullcircle scaled nodesize shifted a;
+    circ:= fullcircle scaled nodespace shifted a;
     ba = circ intersectionpoint (subpath (0,1) of p);
     ea = circ intersectionpoint (subpath (1,2) of p);
     s:= ba{1,1}..b..{1,-1}ea;
-    s rotated an
+    s shifted -a rotated an shifted a
 enddef;
 
 vardef loopPoint(expr a,b) =
@@ -195,21 +208,23 @@ enddef;
 % draw some state with some label insize
 def drawState(expr pos,l) =
     % Draw the circle
-    draw fullcircle scaled u shifted pos;
+    draw fullcircle scaled nodesize shifted pos;
 
     % Draw the label with the right size
     picture lab,reslab;
     numeric height,width;
     numeric size;
-    lab=thelabel(TEX("$"&l&"$"),pos);
+    lab=thelabel(TEX("$"&l&"$"),origin);
     height:=ypart (ulcorner lab - llcorner lab);
     width :=xpart (urcorner lab - ulcorner lab);
     size := sqrt(height*height + width*width);
-    if size>u:
-        reslab:=lab scaled (u/size);
+    if size>.9nodesize:
+        reslab:=lab scaled (.9nodesize/size) shifted pos;
     else:
-        reslab:=lab;
+        reslab:=lab shifted pos;
     fi
+    % help for debug to draw boundaries
+    % draw ulcorner reslab -- urcorner reslab -- lrcorner reslab -- llcorner reslab -- cycle;
     draw reslab;
 enddef;
 
diff --git a/categories/img/mp/hask-endofunctor.mp b/categories/img/mp/hask-endofunctor.mp
new file mode 100644
index 0000000..c67a0d5
--- /dev/null
+++ b/categories/img/mp/hask-endofunctor.mp
@@ -0,0 +1,66 @@
+pair int,bool,func,intlist,list;
+resize(.8cm);
+int=origin;
+% drawoptions (withcolor baseOne withpen pencircle scaled 1.2);
+
+intlist=int shifted (gu,0);
+func=int shifted (0,-.6gu);
+bool=func shifted (gu,0);
+list=func shifted (2u,0);
+
+drawState(int,"\mathtt{Int}");
+drawState(bool,"\mathtt{Bool}");
+drawState(func,"\mathtt{a\rightarrow b}");
+drawState(intlist,"\mathtt{[Int]}");
+drawState(list,"\mathtt{[a]}");
+
+drawLoopPoint(int,int shifted (0,1.6u),"\mathtt{sqrt}");
+drawEdge(int,int,"\mathtt{id}");
+drawEdgeAngle(int,bool,"\mathtt{odd}",-30);
+drawEdgeAngle(int,bool,"\mathtt{even}",30);
+drawEdge(intlist,intlist,"\mathtt{tail}");
+drawEdge(intlist,int,"\mathtt{head}");
+
+pair decal;
+pair fint,fbool,ffunc,fintlist,flist;
+decal := (1.7gu,0);
+fint=int shifted decal;
+fintlist=intlist shifted decal;
+ffunc=   func shifted decal;
+fbool=   bool shifted decal;
+flist=   list shifted decal;
+
+drawState(fint,"\mathtt{F\ Int}");
+drawState(fbool,"\mathtt{F\ Bool}");
+drawState(ffunc,"\mathtt{F\ a\rightarrow b}");
+drawState(fintlist,"\mathtt{F\ [Int]}");
+drawState(flist,"\mathtt{F\ [a]}");
+
+drawLoopPoint(fint,fint shifted (0,1.6u),"\mathtt{sqrt}");
+drawEdge(fint,fint,"\mathtt{id}");
+drawEdgeAngle(fint,fbool,"\mathtt{odd}",-30);
+drawEdgeAngle(fint,fbool,"\mathtt{even}",30);
+drawEdge(fintlist,fintlist,"\mathtt{tail}");
+drawEdge(intlist,int,"\mathtt{head}");
+
+drawblock(fint,fbool,"\mathtt{F}");
+
+pair ff;
+ff = .5[fint,fintlist] shifted (0,u);
+path b;
+b := block(origin,origin);
+draw b scaled .5 shifted ff;
+label.top(btex $\mathtt{F\ F}$ etex, blockLabelPosition(b)) scaled .5 shifted ff;
+draw b scaled .25 shifted ff;
+label.top(btex $\mathtt{F\ F\ F}$ etex, blockLabelPosition(b)) scaled .25 shifted ff;
+
+drawoptions(withcolor yellow withpen pencircle scaled 1 dashed evenly);
+drawarrow edgeAngle(int,fint,45);
+drawoptions(withcolor green withpen pencircle scaled 1 dashed evenly);
+drawarrow edgeAngle(intlist,fintlist,-20);
+drawoptions(withcolor blue withpen pencircle scaled 1 dashed evenly);
+drawarrow edgeAngle(func,ffunc,-25);
+drawoptions(withcolor red withpen pencircle scaled 1 dashed evenly);
+drawarrow edgeAngle(list,flist,25);
+drawoptions(withcolor orange withpen pencircle scaled 1 dashed evenly);
+drawarrow edgeAngle(bool,fbool,-25);
diff --git a/categories/img/mp/hask-endofunctor.png b/categories/img/mp/hask-endofunctor.png
new file mode 100644
index 0000000..f4133c0
Binary files /dev/null and b/categories/img/mp/hask-endofunctor.png differ
diff --git a/categories/img/mp/hask.mp b/categories/img/mp/hask.mp
new file mode 100644
index 0000000..85ed72b
--- /dev/null
+++ b/categories/img/mp/hask.mp
@@ -0,0 +1,22 @@
+pair int,bool,func,intlist,list;
+resize(.8cm);
+int=origin;
+% drawoptions (withcolor baseOne withpen pencircle scaled 1.2);
+
+intlist=int shifted (gu,0);
+func=int shifted (0,-.6gu);
+bool=func shifted (gu,0);
+list=func shifted (2u,0);
+
+drawState(int,"\mathtt{Int}");
+drawState(bool,"\mathtt{Bool}");
+drawState(func,"\mathtt{a\rightarrow b}");
+drawState(intlist,"\mathtt{[Int]}");
+drawState(list,"\mathtt{[a]}");
+
+drawLoopPoint(int,int shifted (0,1.6u),"\mathtt{sqrt}");
+drawEdge(int,int,"\mathtt{id}");
+drawEdgeAngle(int,bool,"\mathtt{odd}",-30);
+drawEdgeAngle(int,bool,"\mathtt{even}",30);
+drawEdge(intlist,intlist,"\mathtt{tail}");
+drawEdge(intlist,int,"\mathtt{head}");
diff --git a/categories/img/mp/hask.png b/categories/img/mp/hask.png
new file mode 100644
index 0000000..b0293ba
Binary files /dev/null and b/categories/img/mp/hask.png differ