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Click on 'Rods', to choose a Cuisenaire rod and then drag it onto the background. More rods can be added in a similar way and aligned as you wish. A rod can be rotated by $90^\circ$ by clicking any key whilst dragging. For a version with a squared background see here
You could use this environment for all sorts of purposes - perhaps to explore addition and subtraction, factors and multiples or ideas about fractions.
For more ideas, look at the Notes
section, or go to this page
where there is a collection of Cuisenaire problems.