Sidney invents a "changing box," which can change whatever he puts into it into something else. This description may be from another edition of this product.
My son adored this book when I read it to him when he was 4 to 6 and he continued to ask for it as he was learning to read it himself. Always making up his own fanciful inventions with household stuff and junk, he really related to the subject and felt validated by his obsession with inventing (now developing into love science fiction). He also delighted in the identity switches, which encourages young minds to imagine beyond their direct experiences and helps develp empathy and tolerance of differences in others.
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