"The general premise is quite simple: A doctor (in the employ of the US government, of course) dosed an artist with acid. The artist was given an “activity box” full of crayons and pencils. Over the course of his trip the artist drew nine different portraits of the doctor and, along the way, reported on his psychological state as his trip and his portraits progressed.
As you can see from the drawing on the left above, the artist is highly skilled, technically speaking. And as you can see from the drawing on the right, the acid has an absolutely remarkable effect on his work, leading him to pure abstraction."
Not sure what drawings I prefer, to be honest.