Claim: The so-called Gestalt qualities were based on scientific experiments leading to the discovery of the 'Gestalt effect' by Maxx Werheimer.
Evidence: The remarkable essay "On Gestalt Qualities," published in 1890 by Ehrenfels has given a name to one of the most characteristic schools of scientific thought in our time and thereby established its existence formally. The qualities were based on tests done by flashing lights for certain amounts of time. This discovery later led to the famous Gestalt effect discovered by Max Wertheimer. 
Max Wertheimer began the formal founding of Gestalt psychology in 1910 as he began experiments on the phi phenomenon. This discovery later led to the famous Gestalt effect discovered by Max Wertheimer.