"Afterthought" The original was lost is why this pen/ink rendering was done... none the less, there were other refinements - emphasises which were done with the pen/ink version which gives the theme/titling better coherance.... this is, of course, the classic - locking the gate after the horses are out... but there is also the bit that a horseshoe in this position is considered, for the superstitious, to be unlucky - another 'afterthought' as it were...... there are, too, a number of metaphoric implications to the 'bolting the barn' which apply to life in general - thus this is, in actuality, a more serious than first seemed piece, even as this whole rendering is done as if itself an afterthought...