I see noracharles and "user name="elf"> already linked you. :) I did just want to point out that although the Spoon Theory is written about lupus, and chronic illnesses in general, it often gets applied to mental health/neurological/etc. issues as well and that's the context I use them in when I'm talking about spoons for myself. I find that there are some differences and ways it's not quite accurate, but there's still the "I need to do X somehow, and to do X I need to do Y, and for that I need Z and U, which means that although I'd really like to do W and V as well I can probably only do one at most and even that one's not certain" when most of these are things most currently-abled people won't even think about. (In this example, Y is going grocery shopping and Z is making myself ready to go out - put on socks, shoes and a coat and find my purse, take my helmet if I'm going cycling. I don't think most people think of these as draining, but for me there are frequently days where I can't even manage Z.)