Everything in existence, due precisely to the fact that it exists, (this includes abstract objects such as the 'concept') has the a temporal dimension and thus all objects classified as two-dimensional by h/w, w/d or h/d in fact also have t.
*-There is a somewhat tricky case, that being the imagined dot: it has at least one width/height/depth dimension (the side that makes the object visible to your imagination) and--what my argument pivots upon--a temporal one. You may argue the imaginary line has no h/w/d, only length, to which I reply, "something with no h/w or d cannot have l lest it cease to e." I could get nit-picky and say that even this imaginary dot has at least two non-temporal dimensions for the very reason used in the preceding sentence. Imagined words take longer to explain, and this is supposed to be bite-size so unless someone contradicts my conclusion, I'll leave that point be.
Suis-je un homme, ou un omelette?