Mark Twain,
Taming the Bicycle
“ The bicycle, in the hands of a novice, is as alert and acute as a spirit-level in the detecting the delicate and vanishing shades of difference in these matters. It notices a rise where your untrained eye would not observe that one existed; it notices any decline which water will run down. I was toiling up a slight rise, but was not aware of it. It made me tug and pant and perspire; and still, labor as I might, the machine came almost to a standstill every little while. ”
