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Cuisenaire Spirals

Stage: 2 Challenge Level: Challenge Level:1
Here are two open spirals made from cuisenaire rods.
  
I used only the even numbered rods.
You can experiment making spirals using the rods on this computer activity below.
There may be some sets of real Cuisenaire rods in your school. 
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Click on 'Rods', to choose rods and and drag them onto the squared background. 
A rod can be rotated by $90^\circ$ by clicking any key whilst dragging.
You can change the  background squares (smaller or larger) using the 'View' menu.

When you've done a lot of exploring you might like to try the something similar with numbers.
If you do, have a look at Number Spirals here.