Noun
motion that continues indefinitely without any external source of energy; impossible in practice because of friction
Source: WordNetArt is the perpetual motion of illusion. The highest purpose of art is to inspire. What else can you do? What else can you do for any one but inspire them? Bob Dylan
Democracy is nothing more than an experiment in government, more likely to succeed in a new soil, but likely to be tried in all soils, which must stand or fall on its own merits as others have done before it. For there is no trick of perpetual motion in politics any more than in mechanics. James Russell Lowell
I were better to be eaten to death with a rust than to be scoured to nothing with perpetual motion. William Shakespeare
When I'm building my dome in my chapel, and I had a vision - I've worked on perpetual motion and I haven't never give it up yet. I still think it could be done, perpetual motion. I had a vision of a un resist able windmill. Howard Finster
Ever since I was a boy, I've been fascinated by crazy science and such things as perpetual motion machines and logical paradoxes. Martin Gardner
Although scientists have established them to be impossible under the laws of physics, perpetual motion continues to capture the imagination of inventors. Source: Internet