Almost fifty years ago, when Haraldur Sigurdsson first came to the University of Rhode Island from Iceland, he got interested in what makes some clam shells more purple than others.

The Purple Tower on Mombasa Road opened with Kenya’s first drone light show, dazzling crowds with LED drones forming shapes and fireworks lighting the sky.

Randburg woman creates purple pap using red wine and maize meal, asking followers which colour to try next. South Africans ...