Making things with your hands is remarkably addictive. The tangible, tactile and often useful finished item is naturally highly rewarding but many have also posited that the "unfinished" nature of more technical handmade projects keeps one's subconscious mind actively pursuing the project, creating constant stimulation and a nagging desire to get out to the workshop. There's also the "legacy" aspect (at the risk of sounding morbid), the underlying desire to extend one's existence far into the future by leaving a body…