The intensity peaks within a solenoid beam are found in a spiral around the line of the beam itself, while a Bessel beam's intensity rises and falls in peaks and troughs at higher distances from the beam's line.
It's partly to break that spell, and partly because there comes a point in any spiral of decline when a line has to be drawn, that 25 of the country's leading wildlife and conservation groups have decided to pool the misery and publish a single, shocking stock-take of the British Countryside.
Inventor, Hideki Watanabe, created the prototype using dental plaster from his practice that he used to line the inside surface of a metal pot in a spiral design.