‘substitution’ symbols presented in
3.1 are the basic tools for students to construct static objects. During the contest, students wanted to
make their artefacts move. As physical construction kits, like Lego WeDo, equipping active motor
or motion sensor with traditional LEGO bricks, have been recently introduced, in JavaMAL
microworld that can be viewed as virtual construction kits, symbols to animate artefacts
‘turtle strap’ idea, constructing a strap by connecting the faces that the turtle makes as moving
forward. The activity to construct dynamic animation along the rail can arouse students’ interest as
well as serve as a tool to explore motion graph pattern.