"Tides 2013/2015,'' by MAGS HARRIES, in her "New Work'' show, April 1-May 3, at Boston Sculptors Gallery.

The planks represent the heights of the moon tide (the highest tide of the month) in Boston for January 2013, consisting of two low tides and two high tides. The top plank is the height of the predicted high tide in 2050.