Sri Lankan rave posters, or what?

Sam Blunden writes: "the image attached is a version of something which I saw loads of in Sir Lanka. The first one I saw was called CHEMISTRY, so I thought great, Sri Lanka has a developed rave scene, what a great thing. Next I saw PHYSICS and I thought, well, its a bit more Steve Silk Hurley than MOONDANCE, but why not - gay overtones and clubbing go hand in hand. It wasn't til I came across BIOLOGY and ECONOMICS that I began to realise these were poster for education courses. anyway, they're beautiful, I think."