What was hot at this year’s Art Basel Miami fair? “One began to discern certain strands. One was for the artist simply to exhibit the most unnoticed of objects just so that one noticed them. Willys de Castro hung two wooden sticks on a wall. Anna Maria Maiolino had framed some torn squares of white plasterboard. After seeing those, one certainly looked at things such as taps in the bathrooms with more curiosity — but not for long.”