We are continuously exposed to visual stimuli in every moment. Processing these visual stimuli are crucial to carry out daily life and professional tasks. Visual thinking and reasoning are at the core of this processing. An architect working on a sketch, a tourist trying to find the way around unfamiliar city, a radiologist examining a scan, or a data scientist choosing the best way to convey a message on a graph all need to rely on their visual reasoning skills. This course aims to introduce visual thinking and reasoning processes and their implications on behaviour by focusing on human cognition.