• visualizationnumbers can be represented by lego bricks, marbles, dominoes, lines, areas, etc. (unary numbers?)there may be limitations.
perfect squares are the sum of odd numbers1 + 3 + … + (2n - 1) = n²#math
https://commons.wikimedia.org/wiki/File:Square_number_16_as_sum_of_gnomons.svg
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