It’s the new math. 1326 South Michigan put up a tower crane last week, raising Chicago’s total to 33.

That tweet from Twitter used @skenrou Saturday morning confirmed the shiny yellow luffer (not fighter) was up and ready to do Walsh Construction’s heavy lifting. 1326 still looks like a barren lot, albeit with a tower crane now poking up through the north edge of the site. But that will all change quickly, as the 47-story tower can now begin to go vertical.