Webel Twin Pattern: A «digital» DigitalEntity (a.k.a. @Entity) is NOT a representation! It is a digital encapsulation (it can only be perceived at the level of "bits and bytes"). It HAS many representations (such as views)!

A crude parametric encapsulation of a «physical» 3D ring might be an annular disk with an inner radius, outer radius, and thickness. These 3 parameters (with values possibly stored in a database) together with the adopted model itself define the «digital» encapsulation, which in turn may have multiple representations (perceivable by humans) such as «digital:visual» views:

‘This is Not a Pipe’ (‘Ceci n'est pas une pipe’)

René Magritte