You most likely happened upon this page for one of two reasons: either you're looking for the site of my kitten, Miss Tesseract O'Neal Andrews, or you're looking for information about Madeleine L'Engle and her books, including A Wrinkle in Time. Eventually, both of those purposes will be addressed here at The Other Yesterday, and links will appear here.
Oh yeah--and if you actually DO want to know what a tesseract is--well, an answer to that will be here shortly as well.