The graphic design is by John Cleveland (Austin, Texas, USA). He painted the psychedelic front in which the red and green creates a retinal clash around the lettering. Typical Poster Art of the late 60'. Another detail is the eye within the eye.
Eye-catcher on the back is the 'the eye of enlightenment' on top of the Pyramid. Of course on the 14th 'floor'! The question is where the enlightment found its origin. The band was seriously into LSD and most songs were about it.
The 13th Floor Elevators is an American rock band from Austin, Texas, formed by guitarist and vocalist Roky Erickson, electric jug player Tommy Hall, and guitarist Stacy Sutherland, which existed from 1965 to 1969. During their career, the band released four LP records and seven 45s for the International Artists record label.
They are often credited as one of the first psychedelic bands in the history of rock n' roll. Their contemporary influence has been acknowledged by 1960s musicians such as Billy Gibbons of ZZ Top, Peter Albin of Big Brother and the Holding Company, and Chris Gerniottis of Zakary Thaks.
Their debut 45 You're Gonna Miss Me, a national Billboard No. 55 hit in 1966.