Meter - Spondee
The spondee consists of two stressed syllables. It is unique in the English language as it is the only metrical foot that does not contain an unstressed syllable.
Because of this nature of the spondee, a serious poem cannot be solely spondaic. It would be almost impossible to construsct a poem entirely of stressed syllables. Therefore the spondee usually occurs alone within - say an apaestic poem.