The metaphysical poets were the general term for British lyric poets in the 17th century, including John Donne, George Herbert, and Andrew Marvell, who shared an interest in supernatural issues and a similar way of exploring them. The most obvious feature of their works is the use of peculiar metaphors (these involved comparisons being known as metaphysical conceits, that is, the metaphorical combination of two things which have no similarities). In addition, the works include witty, imaginative pictures, simple and vague expressions and contradictory statements. Generally, their poetry is mysterious in content and fantastic in form.