What this optical illusion shows is that even the "equality of colour" (supposedly, people can agree that two colours are the same without having to agree on what colour they perceive it to be) experiments can be ambiguous. En un viejo país ineficiente, algo así como España entre dos guerras civiles, poseer una casa y poca hacienda y memoria ninguna. -- Gil de Biedma
The Gestalt effect refers to the form-forming capability of our senses, particularly with respect to the visual recognition of figures and whole forms instead of just a collection of simple lines and curves.
