"The Mud House Mystery" is back. The brothers George and Orange Stearns built the house with barn in the 1850s.  They were likely inspired by the 19th century lifestyle pundit Orson Fowler's book "Home for All".  While the book promotes octagonal houses, and thousands still exist,  some opted for fewer sides and built hexagons.  A few of these have survived. Materials for the concrete structure were quarried on site.  Its stout construction features exterior walls over a foot thick.  The floor plan and central triangular chimney maintain the non square geometry theme.   Large windows with angled jambs maximize sunlight entry, much like arrow loops in medieval castle walls. Nestled on 3 acres, this farmstead is set back from Stearns Ave with 15 acres of undeveloped land, that borders several vernal streams.  While surrounded by forest, the house is in the center of an open sunny yard fostering a wildlife friendly space with regular sightings of animals native to Massachusetts.