1.6.2.2
Circle Animation (condensed)
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Depth-value Notation (base 2)
    Counting and Reading
Boundary Calculation: Making Patterns Simple
    Join and Take Apart Units and Boundaries
Addition: Sharing Space
    Join Four Units; Join Five with Seven
Subtraction: Making Nothing
    Take One from One; Two from One; Seven from Five
Multiplication: Unit Substitution
    Three by Two; Five by Seven
Division: Finding Patterns
    Twos in Six; Fives in Thirty-Five
boundary math
numerics
circle numbers
full animation
∆ short animation
add/mult animation
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Boundary Integers as Circles (condensed version, 4 minutes)