Creating an optical illusion to make a shape in the sand appear as if it’s upright

An anamorphic illusion is a picture or scene that only makes sense from a single vantage point. It’s an eye-catching visual trick that’s been used by artists for centuries in everything from classical art right through to those adverts we’ve all seen that are painted onto sports pitches to look as if they’re upright. It’s a fun project to try on a sandy beach with a laptop, a rake, some pegs and string…