Early owners of one copy of this album were entitled to rights over one square foot of the earth situated at Llanerchyrfa in the County of Brecon, Wales in Great Britain. The inner sleeve included a coupon that had to be sent for registration. This was part of the promotion activities linked to the album that had ecological inspirations. There was no swindle and thousands of fans were registered. Registration could be done on or before 31 December 1975.