How I love to paint on birch!  This piece is fitting to have wood as its surface - the little birdhouse in this reference has weathered many storms.  In fact, the rock holding its roof on is an indicator of just what it's faced over the years.  Such a character home for the mountain bluebirds or whatever species decides to become the tenant :o)  Oft have I passed these birdhouses on rural roads.  Birdhouse - Home of the Blues?