One hypothesis was that reported reversal rates of Necker cubes with 6-in. horizontals and verticals that varied in 5° of completeness would correlate significantly with 3 measures of spatial visualization. The second hypothesis was that 6-in. cubes would result in lower reversal rates than did the 3-in. cubes used by Smith, et al. (1968). The first hypothesis proved to be untenable while the second remained tenable. Individual differences in reversal rates were large but fairly consistent since the correlations among reversal scores ranged from .71 to .97, with a median of .88.
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