Ooh, I genuinely love the real-time data! We should draft an interview guide and present the results of our interviews to MK's teacher as a series of case studies. I'd pay to see her expression, MK! wink

I remember reading a study (Patricia Kuhl or her husband, I believe) a while back that suggested that children's ability/inability to disconnect height from size was really a question of language. As in, the vernacular "big/small" were used imprecisely to apply to a number of different dimensional changes, so children didn't fully conceptualize that height is a different dimension from total volume, quantity of receptacles, and so forth. Perhaps this is more of a language arts exercise than one in math.

What is to give light must endure burning.