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Abstract
This web applications shows off building a graphical user interface with Node.js. It retrieves inputs from the user, call's a python core to calculate the x,y points for a Spirograph, and uses the Plotly.js javascript interface to visualize the data. This application also uses Bootstrap (getbootstrap.com) to help with layout, MathJax (mathjax.org) for rendering the spirograph formula, jQuery for client side javascript stuff.