On one recent visit to this exuberant survey, a group of kindergartners could be seen doing just that under a bright-red cube originally conceived by Tsuruko Yamazaki for an outdoor festival in 1956, and reconstructed here.

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Built in 1800, Hank McNeil's Neo-Georgian 13, 000-square-foot Rittenhouse Square mansion is red brick and cube-shaped, with rectangular double-hung windows all aligned and a red front door flanked by Corinthian columns.

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The first floor holds the bedrooms, including a cube-like guest room decorated with a double bed and bright red chair as an accent.

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