Like his medium, his method combines the old and the new: he draws with a traditional Japanese brush dipped in ink, but adds occasional colour on a Mac.
"One traditionalmethod involves cutting large bundles at low tide and roughly tying them together with net or old rope, anchored on rocks, " Mr Walsh says.
Today, customers who have credit cards embedded with that technology have the option of waving a card in front of a reader, instead of using a traditional swipe method.