Logo challenge - the logic of logo

Just four procedures were used to produce a design. How was it done? Can you be systematic and elegant so that someone can follow your logic?
Exploring and noticing Working systematically Conjecturing and generalising Visualising and representing Reasoning, convincing and proving
Being curious Being resourceful Being resilient Being collaborative

Problem



Just four procedures were systematically used to produce the design below.

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LOGO Challenge - The logic of LOGO

How would you set about the task of deciding what to do? Can you use fewer procedures? How would you replicate this design?

How systematic were you in your endeavours?

You can download some excellent free LOGO software from the internet at http://fmslogo.sourceforge.net/.