<P> According to Led Zeppelin archivist Dave Lewis: </P> <P> In retrospect,' Houses of the Holy' holds its ground with the middle period releases quite admirably . The barnstorming effect of the early era was now levelling off and though devoid of the electricity of' Led Zeppelin I' and' II', or the sheer diversity of the third album, and lacking the classic status of the fourth,' Houses' took stock of their situation . In doing so, it laid several foundations on which they would expand their future collective musical aspirations . </P> <P> The cover art for Houses of the Holy was inspired by the ending of Arthur C. Clarke's novel Childhood's End . The cover is a collage of several photographs which were taken at the Giant's Causeway, Northern Ireland, by Aubrey Powell of Hipgnosis . This location was chosen ahead of an alternative one in Peru which was considered . </P> <P> The two children who modelled for the cover were siblings Stefan and Samantha Gates . The photo shoot was a frustrating affair over the course of ten days . Shooting was done first thing in the morning and at sunset in order to capture the light at dawn and dusk, but the desired effect was never achieved due to constant rain and clouds . The photos of the two children were taken in black and white and were multi-printed to create the effect of 11 individuals that can be seen on the album cover . The results of the shoot were less than satisfactory, but some accidental tinting effects in post-production created an unexpectedly striking album cover . The inner sleeve photograph was taken at Dunluce Castle nearby the Causeway . </P>

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