Parabolic curves, diabolic shapes, tessellation, flextangles, symmetry and much more. Discovering that maths can be creative and dare I say fun! Gertie has known this all along but it has taken me about 30 years to unschool myself and rediscover maths in a new light.
Try this one out http://babbledabbledo.com/paper-toys-flextangles/
This is not a maths Book by Anna Weltman is fantastic for some inspiration.
butterlionsanddandycups 
What a find. Looks like fun.
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