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I think the issue lies in holding the eraser. If the eraser is *only* eraser, then you have to hold it with your fingers somehow, and you will never get to use the last little bit. They have made pen-style erasers, where you click the top and more eraser will come out the tip, which seems to use a lot of the eraser, but still, there will be a bit that needs to be held in at the end, unusable. Plus there's the environmental impact of making and disposing of the pen (even if it's refillable it will go int he garbage someday). In that case it's doing more harm than good, we think "oh, we can use more of the eraser this way" but really instead of throwing away a small eraser bit we are throwing away a smaller eraser bit and a thick plastic pen-thing.|
Oh!!! KNEADED ERASERS!!! Maybe these are the best, though I'm not sure what they're made of. We used them in art school. They're grey, and you mush them around, folding them over if they're dirty, molding part of it into a little point if you need to erase a tiny bit, and they work very well. And they're something for your hand to play with while you are thinking. (And they last a really long time!)
So, I don't know if it's possible to make an eraser better. I think the kneaded eraser is the best, and it gets my vote for being the highest innovated eraser on the market. (or at least the most practical and best quality and useful and economical and best for the environment if it's no worse than a regular old pink school eraser.
I can't believe I just spent so much time on this. Is this a psychological test? Did I fail for having ADD, coming here to talk about the future of erasers when I should be doing other things?