Wolfgang Köhler, a German gestalt psychologist, conducted learning studies using animals, in which he created the term ‘insight learning’. He described his work in the 1917 book ‘The Mentality of Apes‘. Köhler expanded the notion of simple ‘trial and error’ to suggest a mental process which visualises a problem and considers a solution before taking action, triggering ‘aha’ or ‘light-bulb’ moments. For example, Köhler tells of observing an ape trying to retrieve a banana out of reach: the ape stops for a moment and then uses a nearby stick to pull the banana within reach. Köhler saw this as the ‘insight’ thought process leading to alternative action, i.e., visualising a problem and considering a solution before taking action. He presented this ‘insight’ as reflective thought, which equates to the ‘reflective observation’ stage in Kolb’s learning cycle.