A Useless Exercise

Practically useless, although undoubtedly 'clever':



It's so childish that it really is 'clever' only in an infantile sense and about as entertaining as Newton's Cradle. Having built one though, it was only a matter of time before some other 'clever' person thought of this:



Why do I post the videos here? Purely because, believe it or not, I have a severe hangover and am therefore useless myself at present.