Some years ago David Wiley defined a learning object as “any digital resource that can be reused to support learning”. In his work “Connecting learning objects to instructional design theory: A definition, a metaphor, and a taxonomy” he gives examples of small and large reusable digital resources and he explains his choice. The definition is focused on a homogeneous set of things: reusable digital resources and at the same time is still based on the original idea provided by the Learning Technology Standards Committee.
I chose Prezi for my attempt of a learning object because it was something I had never tried before and because I realized it really enabled reusability.
Check Wiley’s work here.