This is a thoroughly interesting subject, shadows are the thing you often try to avoid when taking photographs, yet shadows can make a photo more interesting. CFFC.
I have also covered this topic before … Shadows.
This was an accidental shadow.
This one very deliberate.
This one too, the shadows added to the mood.
Also the next photos were oldies I found.
I was in an old derelict watch tower, looking out of a barred up window.
And finally, my daughter creating an interesting shaped shadow in front of one of those interactive screens. The screen poured ‘leaves’ on your shadow no matter where you stood. The photo is years old and is of poor quality, a spur of the moment phone camera shot in a darkened room. I kept it all the same because I love my little cat-daughter.