We are investigating whether non-CNS cancers and their treatments affect visual colour perception and interpretation. Participants will complete a short online test using digitally presented Rorschach-style inkblot images, followed by simple questions about what they see and a brief mood survey. The goal is to understand whether cancer patients process visual information differently compared to healthy controls, and whether changes in colour perception could serve as a low-cost, non-invasive digital biomarker for cancer progression or treatment effects. Participation is anonymous, voluntary, and remote, all you need is an internet connection. Data will be securely collected through a Google Form. By joining, you’ll help us explore a new frontier in citizen science and oncology, where creativity, psychology, and biomedical research meet.