THE END and PUZZLE optical illusion | created by Peter Newell
As we turn the image (with word "the end") upside down, it will reveal a completely new word "puzzle."
BTW, this ambigram is from the last page of Peter Newell's "Topsys & Turvys," a 1893 released puzzle book. While inverted, each page of the book reveal a completely different image.
You can buy the puzzle book "Topsys & Turvys" at Amazon.