A brick rotunda
Build a circular wall, course by course.
Two walls with the same amount of finished work may have different readiness, histories or available lifting capacity. Those differences can change the next useful move.
Begin with choices and histories, then examine a finite construction in which two brick rings share hoists and obey explicit placement and curing rules.
Explore the questions
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The simple primer and the later construction have different rules. Their results concern those toy rules, not a building forecast.