Official safety messages are being written in the sand to warn people about the dangers on specific beaches.
The scheme being trialled in Cornwall includes information on tide times and rip currents.
Graphic designer David Revell came up with the idea in response to a design challenge set by the RNLI to find new ways of delivering safety messages.
He said: "Because it might be unexpected and unusual, we hope that it will capture beach goers' attention".
The idea came to him as he was watching his family writing on the beach, and he developed a system using rakes, ropes and pegs to make the letters uniform.
"The concept is simple really - to create signs in the sand that could direct beach users to either the safest part of the sea, or inform them of potential risks and how to avoid them."
The sand signage is being trialled at Perran Sands, Bedruthan Steps, and Watergate Bay.
The letters are 6ft 6in (2m) by 9ft 10in (3m) high. Mr Revell decided on this optimal size after testing the font's legibility from distance as well as his ability to make the characters look professional.
Steve Instance, RNLI Community Safety Manager said: "Last year, 25 people lost their lives on the coast in the south west.
"Too many people are getting cut off by tides or being caught out in rip currents, so we're exploring new ways of raising awareness of these dangers."
He hopes the beach art will help to reduce the number of people who get into difficulties in the sea.
If the project is successful, it could be rolled out to other areas.
All pictures copyrighted.