BBC’s Horizon screened a documentary last week called Do you see what I see? It’s premised on the idea that colour vision is an “illusion”. I can see why the notion is appealing—and I’m sympathetic to certain versions of it—but in the end the programme doesn’t manage much more than a superficial treatment. Which is a shame, because I think their 1984 Colourful Notions still holds up well today (watch it on YouTube here). Their latest effort is still worth a look, though, as there are plenty of interesting moments.