This is most certainly "Here we again time".
Man: Be Good To Yourself Twice A Day - best ever fold out LP cover and a delight to my Welsh neighbours
Heaven: Heaven (anglo-welsh brass rockers of the early 70's) album cover folds out to a 5 foot high picture of a totem pole. (An Isaac Hayes album cover folded out into a 4 foot high cross)
The first edition of the first Led Zeppelin LP cover's had its printed words in turquoise rather than the familiar orange - included here more for its rarity value.
Saturnalia's transparent LP sleeve revealed the first full 3d effects LP disc. (Curved Air had done it before but only with the album label). Rolling Stones Satanic Majesties had a 3d effects picture glued onto its sleeve
Pink Fairies' Never Never Land in a transparent printed PVC sleeve
Small Faces' Ogden Nut Gone Flake LP sleeve was round. The limited CD version was in a tin box (predating John Lyden album - Box? - in the same type of container).
Edgar Broughton Band LP (3 or 4th album) did some trickery depending on which way you folded the sleeve.
Jefferson Airplane's Bark came in brown paper supermarket bag
First Soft Machine album having 'cogs' which turned - an idea stolen (not unusually) for the later 3rd? Led Zeppelin album.