Full Idea
Holes are things of such a kind that they can coincide without being identical - as are, for example, shadows and spots of light.
Gist of Idea
Holes, shadows and spots of light can coincide without being identical
Source
E.J. Lowe (Two Notions of Being: Entity and Essence [2008], 1)
Book Reference
'Being: Developments in Contemporary Metaphysics', ed/tr. Le Poidevin,R [CUP 2008], p.28
A Reaction
His point is that they thereby fail one of the standard tests for being an 'object'.