If you go to the related link (which is the archive of the theatre in Dublin where it was shown) you will find a list of the cast there.
Divisibles, the 6 foot man would cast a shadow 2 feet long.
That all depends upon what time of day the shadow was cast. For example, at straight up noon, even a very tall building wouldn't cast much of a shadow, but at sunrise or sunset, even a tiny building might cast an 18 foot long shadow, or even longer.
It works out as 30 feet in height
The cast of The Shadow of a Gunman - 1972 includes: Frank Converse as Donal Davoren Richard Dreyfuss as Tommy Owen Jack MacGowran as Seumas Shields
The cast of Shadow of Death - 1923 includes: Jose Collins as Gyp Lionelle Howard as Dandy Arthur Wontner as Sir John Bellingham
The cast of Gunman - 2010 includes: David Rezek
The cast of The Gunman - 2013 includes: Angelo Poulos as The Victim
The cast of The Caseys - 1999 includes: Clancy Brown as Pete Casey Natalie Shaw as Series Regular William Thomas Jones as Yannick Susanna Thompson
The cast of The Gunman - 1914 includes: Miriam Cooper as Mattie Sam De Grasse as The Gunman Ralph Lewis as Thorne - the Foreman Eugene Pallette as Farrell
The cast of Peace of Dan - 2013 includes: Jason Galvez as Eddie Michael Ken Kimura as Gunman 6 Johnathan Schenk as Gunman 2 Frank Strebel as Dan Mark Vukovich as Gunman 3 Seth Welday as Gunman 5 Sam Zapiain as Gunman 1 Peter Zapiain as Gunman 7
The cast of Banana Bread - 2010 includes: Dominic Bernacchi as Gunman Gary Blankenhorn as Door Guard Rad Daly as Gunman Michael Evanet as Gunman Deena Freeman as Phyllis Meyerson John Livingston as Matt Meyerson Chad McKnight as Gunman Joe Mitchell as Gunman Mark Rayner as Gunman Erik Rondell as Gunman Robert Silver as Stuart Meyerson
Vampires do not cast a shadow. They do not have a reflection either.
Cast a Bright Shadow was created in 2004.
Cast a Dark Shadow was created in 1955.
I'll Cast a Shadow was created in 2000.