Uh? I do not need help for 4D. Thank you !
A 4D object could be :
- a hyper-geometric form;
- a mechanical link;
- the autonomy of a located vehicle;
- the conditions of a vegetable;
- a non-single black hole
- and other...
It could be thausend and thausend of things... It is this I do not understand : your titled question is a little bit too general...
An artistic answer maybe ?
(already published
here very good subject also...)
Space-time