When an object casts a shadow, the resulting shadow shape is dependent on a number of factors beyond the characteristics of that object itself. The angle and direction of the light, intensity of the light, number of light sources, and the shape of the surface onto which the shadow is being cast all play a role in the resulting shadow. When the surface in question is varied, the shape of the object casting its shadow gets transformed and distorted. Stairs, with their multiple planes, bend shadows that fall onto them into zig-zaggy shapes.
Albuquerque, NM. January, 2006.
At MIT, inside the Stata Center. April, 2010.
At MIT. April, 2010.
In New York City, going up to the High Line. March, 2012.
At the karate school, at a nearby Massachusetts town. February, 2013
collecting tokens 
I LOVE THESE! all of them. Alejna, you rock! (hmm. That looks weird. I am not calling you a stone. “rock” is a verb in that context. But then, you’re a linguist, so you probably knew what I meant. Maybe I should get more sleep.)
love that last one.
What a fabulous collection. Oh, I love love it. Wish I could beam you to Harpa concert hall in Reykjavík to see what you make of the shadows inside the building!
Love.
Oh, you saved the best one for last. I’m a Shadow Seer too. It’s make life one big graphic design.