Another person associated with this movement, Kurt (*) Koffka, wrote an introduction to its theory titled Perception and participated in studies of the phi phenomenon with Max Wertheimer.  
Erving and Miriam Polster wrote a book about integrating this type of therapy that was earlier advocated by Isadore From, who was himself an early student of Fritz and Laura Perls.  One person associated with this movement argued against Thorndike's Law of Effect by claiming that some animals experience a moment of insight when figuring out how to construct a ladder from boxes in a book which was based off of research he conducted in the Canary Islands.  Another person associated with this movement, Kurt (*) Koffka, wrote an introduction to its theory titled Perception and participated in studies of the phi phenomenon with Max Wertheimer.  Also ssociated with graphics such as the Rubin Vase and the Necker Cube and the principle that the sum of the parts is greater than the whole, for 10 points, name this German psychological movement.
Erving and Miriam Polster wrote a book about integrating this type of therapy that was earlier advocated by Isadore From, who was himself an early student of Fritz and Laura Perls.  
{Gestalt} psychology (accept {Gestalt} therapy before "animals")