In the human mind there are numerous areas responsible for what we refer to as emotion; collectively, these regions comprise the emotional system.| The Interaction Design Foundation
The golden ratio—often symbolized as the Greek letter Phi (Φ)—is a mathematical constant approximately equal to 1. 618033987.| The Interaction Design Foundation
Ensure designs meet user goals with functionality: It' s crucial for reliable, purposeful products. Usability tests verify consistent performance.| The Interaction Design Foundation