Decimal art
This tool makes nice little diagrams of the decimal expansions of the input number. For example, Pi would display with lines connecting 3 to 1 to 4 and so on. I'm not sure of the practical application of this tool (probably limited to none), but I found it fun to make, and I find some of the patterns produced quite fascinating. Some random ideas for you to try: pi, 1/47, sqrt(2)/log(3). I personally find that fractions make the nicest images, because of the patterns they produce. Try 1/7, 1/19 or maybe 1/123. Maybe have a think why the patterns are produced the way they are :)
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