This Lattingtown Colonial, on the market for $3.4 million, is a lesson in geometric shapes. Built in 1989 and designed by Pietro Cicognani of Cicognani Kalla Architects, the house consists of two buildings, one round and the other angular.

The public rooms within the rounded main house are either round or semicircular. A seating area in the library is set on an elevated, circular wooden platform in the middle of curved walls of bookshelves. Below is the living room, which is semicircular, as are the master bathroom and a wet bar that is at the top of a circular stairway.

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A rectangular breezeway, with French doors leading to a brick courtyard, connects the main house to the more angular two-story structure. That structure contains an office, living room, kitchen, three bedrooms and a bathroom. The home has a total of six bedrooms, six bathrooms and one half-bathroom. Other features include an eat-in kitchen, formal dining room, two fireplaces and two two-car garages.

Numerous windows, in a variety of shapes, bring in lots of light throughout the home. The property measures a little more than 4 acres and offers an in-ground L-shaped pool.

The listing agent is Susana Muir of Daniel Gale Sotheby's International Realty.