In the Saturday Spotlight, we’re checking out a few major exhibitions before the close. At the Kimbell Art Museum, it’s your last chance to catch “Picasso and Braque: The Cubist Experiment, 1910–1912.” And this is your final opportunity to walk down the musical stairs that lead to “Sightings: Martin Creed” at the Nasher Sculpture Center. We’ve been all over each of these shows here at Art&Seek, so be sure to read up on “Picasso and Braque” and “Martin Creed” before you go.