Basically it's just Roger Waters going crazy. No instruments, just him clapping hands, babbling insensically and making those weird trademark screams of his.
Pink Floyd -
Which is frankly ****ing awesome. From all of their psychedelic pieces this is best and definetly best early era song until Meddle album
Water's trademark screaming at its finest around 3 minutes mark
When I was younger this song freaked me out.
"Down, down. Down, down. The star is screaming.
Beneath the lies. Lie, lie.
Careful, careful, careful with that axe, Eugene.
The stars are screaming loud."