From Nur Ankh AMen's "The Ankh: African Origins of Electromagnetism":

"A circuit consisting of a loop and plates (in the shape of an ankh) could also provide lighting at night or in the darkness of the tomb. It has always been a mystery as to what method of lighting was used to allow those intricate paintings to be produced on the walls of some of those tombs. No soot was found on the ceiling suggesting that some other method besides the torch was used. Again we are asked to believe it was done with mirrors reflecting sunlight, because the truth of electric lighting in tombs would suggest widespread use similar to our modern use, but superior, because power would be wireless transmitted."