Geometry of a Shadow

     This morning while exercising I listened to an old CD that had been stored with materials I used when involved with the The Children's Museum (in Bloomsburg, PA).  The recording included selections from A Child's Garden of Verses by Robert Louis Stevenson (1850-1894) and as I listened to "My Shadow" I connected it with my blog -- a poem of geometry and mappings.  Here it is; enjoy!

     My Shadow    by Robert Louis Stevenson (1850–1894)
 
     I HAVE a little shadow that goes in and out with me,   
     And what can be the use of him is more than I can see.   
     He is very, very like me from the heels up to the head;   
     And I see him jump before me, when I jump into my bed.