Mitch writes “The following is the basic pattern for building cantilevered structures with Pennies. Although it looks trivial, we can build amazing structures with these pillars. All penny columns are ten high, a “stack”. Two side-by-side pennies held in place by a penny above them is called a “triad”. Below is a stack with two triads resting on top.” Thanks Tim! Link.
HOW TO – Stack pennies