After having read both authors, I have to say that I would like to read more of both (I think I connected to Vian more because of the absurdity than anything else - a "mushroom" connection, as it were). I do think that Vian would be almost impossible to transfer from a book to other media, because of the double meanings, the word play and the oddness of it all.

I might try L'Automne à Pékin next - based on your comments, it might be something that I would connect with better. Since I bought the two-volume Pléiade version I think I can choose from anything he wrote, and I know that I have i>L'Automne à Pékin since it immediately followed L'Écume des Jours.

For Racine, I might pick Andromaque next. I don't think I'd ever want to see his plays actually staged, because I imagine them to involve lots of Greek helms with the horse hair, and long spears and lots of posing. However, from a language perspective, the richness of his plays is just amazing.