The album was the first released on the group's newly formed Threshold record label, which was named after the band's previous album from the same year, On the Threshold of a Dream. It was inspired by the 1969 moon landing, and the songs centre on the twin themes of space travel and children, with minor-key tonalities and a distinct psychedelic influence. It is the fourth of what are popularly considered the group's "core seven" (or Classic Seven) albums from 1967 to 1972.

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