Relying on the knowledge from psychology and how our minds work regarding perception, memory and processing visual data can significantly help us design interfaces that will contribute to the overall experience of the users.
Our perception works in a way that we always perceive objects in relation to each other. That means that how we will perceive e.g the main call to action in our UI depends almost 100% on its surrounding objects.
2. Mastercard has strict requirements on how you display their brand and in which size in the UI