Yes, your shed does need a base. This is to give it a solid, level foundation. Open soil will not help with the longevity of the shed itself or the contents within. The best materials to use to make your shed base are concrete, natural stone or wood.
Delabole
Delabole is a large village in north Cornwall, England, UK. It is situated approximately 2 miles (3 km) west of Camelford. It is in the civil church of St Teath. The village of Delabole originated in the very early 20th-century; it is named after the Delabole Quarry. Three communities: Pengelly, Meadrose (pronounced "médroze") and Rockhead, and the hamlet of Delabole southern of the quarry are revealed on the earliest one-inch Ordnance Survey map of 1813. When the railway arrived, the terminal was called Delabole after the quarry, and also the three districts were absorbed right into Delabole. It is stated to be the third highest possible village in Cornwall. Treligga armed forces landing strip and HMS Vulture II, an aerial battle and gunnery variety, were positioned west of the town. Delabole lies within the Cornwall Area of Outstanding Natural Beauty (AONB).