Hi, I have the following question: I want to draw a bouncing ball. First thing I do is create a class: EllipseMorph subclass: #Ball instanceVariableNames: 'position' classVariableNames: '' category: 'PBE-BouncingBall' Then an initialization method that mostly do a super initialize. Then the drawOn: drawOn: aCanvas aCanvas borderWidth:10; borderColor: Color green. And finally a position method: position: aPoint super position: aPoint. position ^ position. Finally in a Playground I do: | aBall | aBall := Ball new. aBall position: ( 10@10 ). aBall openInWorld. But I get a red box with two crossing yellow lines. What I'm missing? Thanks in advance. Nacho ----- Nacho Smalltalker apprentice. Buenos Aires, Argentina. -- View this message in context: http://forum.world.st/Question-on-Morphic-drawOn-method-tp4803695.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.