If you found yourself in the Design District this past Art Basel, you might have stumbled across one of Domingo Castillo's street posters supposedly advertising a missing cat but actually leading to an alternative space, Dimensions Variable. Castillo created the poster as part of the exhibition "G-Spot: Get the Green Light," which highlighted Miami's rising talent during December's citywide arts confab. Castillo's cat was just one of the red herrings that fill the inscrutable artist's works. At Dimensions Variable, the 23-year-old set up a makeshift karaoke bar for an exhibit titled "Duets." But unless you personally knew Castillo or were the guest of one of his friends, your dreams of joining him on the microphone for a rendition of "Cat's in the Cradle" were dashed. In fact, spectators outside the gallery were the ones who truly got to experience the spirit of the art, which was in fact a commentary on the exclusivity of Basel. Castillo is also one of the founders behind the End/Spring Break, a nomadic art project responsible for some of the quirkiest and most thought-provoking cultural programming in the Big Mango the past year.