The Aeternus Aenigma, a “hypnotic spectrum” puzzle which changes colour based on the viewer’s perspective, has also proven a boon for online toy retailer CMY Cubes since its launch in 2023.

Their original cube proved popular online, with nearly 1000 pre-orders even before it was physically manufactured. “We launched our first product, the original CMY Cube on TikTok,” Ms Saper said.