 The thematic elements Jethro Tull explored on the album — those of the effects of urbanisation on nature , and of the effects of social constructs such as religion on society — would be developed further on most of the band 's subsequent releases . Ian Anderson 's frustration over the album 's labelling as a concept album directly led to the creation of Thick as a Brick ( 1972 ) , intended to be a deliberately " over the top " concept album in response . 
