Fontana/Collins, Glasgow, 1975
Cover painting by Oliver Bevan.
I do love the Fontana Modern Masters series, more for their colourful geometric cover designs than the worthy philosophical content. It's nice to remember that these were proper *paintings* rather than something dashed off in 5 minutes using Photoshop.
I was going to write a bit about them but quickly discovered the uber-resource, so I will direct you here instead.