diff --git a/repository/Grafoscopio/GrafoscopioNode.class.st b/repository/Grafoscopio/GrafoscopioNode.class.st
index ff3ae30..95b8356 100644
--- a/repository/Grafoscopio/GrafoscopioNode.class.st
+++ b/repository/Grafoscopio/GrafoscopioNode.class.st
@@ -74,16 +74,15 @@ GrafoscopioNode >> addLink: anUrl [
 	
 ]
 
-{ #category : #'add/remove nodes' }
+{ #category : #adding }
 GrafoscopioNode >> addNode: aNode [
 	"Adds the given node to the receivers collection of children, and sets this object as the parent
 	 of the node"
-	
+	aNode parent = self ifTrue: [ ^ self ].
 	self children add: aNode.
 	aNode level: (self level) + 1.
 	aNode parent: self.
-	^aNode 
-	
+	^aNode
 ]
 
 { #category : #'add/remove nodes' }
@@ -846,7 +845,7 @@ GrafoscopioNode >> parent [
 { #category : #accessing }
 GrafoscopioNode >> parent: aNode [
 	"A parent is a node that has the current node in its children"
-	parent := aNode
+	aNode addNode: self.
 ]
 
 { #category : #'add/remove nodes' }
@@ -948,6 +947,20 @@ GrafoscopioNode >> specModelClass [
 	^ GrafoscopioTextModel
 ]
 
+{ #category : #'as yet unclassified' }
+GrafoscopioNode >> surfaceCopy [
+	"I copy the most relevant values of the receiver. I'm useful to avoid copying references
+	to the rest of the container tree, which could end in copying the whole tree."
+	| newNode |
+	newNode := self class new.
+	^ newNode
+		header: self header;
+		body: self body;
+		tags: self tags.
+	
+	
+]
+
 { #category : #accessing }
 GrafoscopioNode >> tagAs: aTag [
 	"Tags the recipient node with aTag (string). For the moment we will have only one tag. 
@@ -975,6 +988,11 @@ GrafoscopioNode >> tags [
 	^ tags
 ]
 
+{ #category : #accessing }
+GrafoscopioNode >> tags: aCollection [ 
+	tags := aCollection
+]
+
 { #category : #accessing }
 GrafoscopioNode >> title [
 	"Returns the receiver header"