Some restaurants want to make their portions look bigger. Others may want to seem to deliver a modest portion while still satisfying hungry diners. For years, chefs have exploited what’s known as the Ebbinghaus illusion to push the apparent portion size in one direction or the other. Serve a dish on a small plate, and it looks bigger. Put the same food in the middle of a much larger plate, and the portion seems smaller. But, this illusion isn’t just for eateries – marketers of all kinds can exploit what’s known as the Ebbinghaus illusion. […]