Fecha de publicación: -- Fuente: WIPO "circular economy" A reverse vending machine receiving items from an identified user. At least one image sensor observes the item in the machine, a tracking module tracks the item in order to determine whether it has been properly returned, and if so, at least one image from a sequence of images of the item is selected to be analyzed by an observation module to determine if the item is associated with a reward. A reward initiation module initiates provision of a reward to the identified user. A ramp is arranged such that when an item passes through the machine it will tilt when passing over the top or off the edge of the ramp allowing the image sensor to observe the item from different sides. The observation zone may also include mirrors to provide a view from more than one angle. Corresponding methods are also disclosed.