WRITTEN BY Blair Farris Years ago when Allison Armour Wilson was looking for a modern water sculpture for her garden in Sussex, the lack of choices led her to design her own. Fast forward 15 years, Allison is now living in Santa Barbara and has a thriving business with pieces in private gardens, museums, universities and public spaces across the world. The “Aqualens,” the original centerpiece in the garden she designed for the 2000 Chelsea Flower Show, combines modern materials with …