I've always wanted to take a picture inside this tunnel, which divides Colonia Condesa, the Zona Rosa, Colonia Roma and Colonia Juárez on Avenida Chapultepec. But there are no walkways along its sides, and given how chilangos like to drive, I would no doubt never make it out of there alive if I tried. But I love the imagination of painting the walls of a tunnel as if they were an aquarium or the ocean. Or a huge fishbowl.