Madeleine L'Engle passed away last week (Sept 6). I wrote about her a few months ago. Some have compared her fictional series starting with A Wrinkle in Time to that of Lewis' Chronicles of Narnia series.
The picture above is of a Tesseract, mentioned in A Wrinkle in Time, and is essentially a four-dimensional cube. Four spatial dimensions, not three-spatial plus time. I can't quite wrap my head around it. Fascinating stuff though.