I recently became aware of Cistercian numerals, a system for writing numbers up to 9999 which was developed in the middle ages by the Order of Cistercians. Personally, I think they have a pleasant geometric form which could be well suited to turtle graphics:

In this series of posts, I’ll walk through one way of teaching the Logo turtle to draw Cistercian numerals in ucblogo (Berkeley Logo). We’ll start with the numbers zero through four and then build up from there, eventually getting to the full range of numbers from 0 to 9999.

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