incantdescent
The first type of light bulb that Thomas Edison came up with, i.e., the hundreds of experiments that failed. Although Edison didn't consider these unsuccessful attempts "failures"... when someone asked him why he kept trying to invent a light bulb when he had failed so many times, Edison calmly replied, "I have not failed 1,000 times. I have successfully discovered 1,000 ways to NOT make a light bulb."
It is indeed interesting to see Thomas Edison's finished light bulb, but I would be curious to see what some of his incantdescent-bulb creations looked like, as well.