In an age of smartphone schedules, pop-up reminders and Facebook timelines, a hanging wall calendar might strike us as something preciously outmoded. There is nothing sentimental, however, about the 36 wall calendars recently presented by the Chinese artist Song Dong at Hong Kong’s ArtisTree arts venue.

Don’t let the size fool you. Ai Weiwei’s “little black book” will leave a lasting impression. Weiwei-isms is a volume of truisms by one of the most significant albeit, controversial artists practicing today.