You don't need to understand French to appreciate the project. In 1964, the Swiss pharmaceutical company Sandoz (now Novartis) commissioned the Belgian writer, poet and painter Henri Michaux to produce a film that demonstrated the effects of hallucinogenic drugs. The company saw the film as a way to help its scientists get closer to the hallucinogenic experience -- not surprising, given that Sandoz was the company that first synthesized LSD back in 1938.
Henri Michaux had already published accounts where he used words, signs and drawings to recount his experiences with trip-inducing drugs. (See his translated book, Miserable Miracle.) And that continued with the new film, Images du monde visionnaire (Images of a Visionary World.) At the top, you can find the trippy segment devoted to mescaline, and, below that, Michaux's visual treatment of hashish. Watch the complete film, except for one unfortunately blemished minute, here.