Newberry Award Winner.
Introduced me to the "tesseract."
Took years before I realized they were talking about a hypercube.
They used the term as a verb in the novel to indicate the act of traveling interdimensionally.
Even shorted it to "tesser."
That was pretty dumb, but I enjoyed the book anyway.
I think she did it intentionally. I had no idea what it was because I was between K and 6th grade and it was a form of math I wasn't even aware of yet. But I do remember it being the first time I became interested in the concept of a fourth dimension. I can't remember the physical description of the tesseract in the book, but i do remember the father found it and that was how he slipped in to the tesseract or wormwhole. Anyways I think it was done purposely to spark the interest in kids. It was a great book.
Is it one of the books they make kids read in school?