1) Interesting things.
2) Things that stimulate the latent interest nerves.
3) Things you can look at or into.
4) Things you can listen to or sounds you can create.
5) Puzzling things*.
6) New things that perhaps you’ve not noticed before.**
7) Surprising things***
8) People can at times be interesting and so demand a degree of observation.
9) Stories - in whatever form of media they are told.
10) Interest (general).
* Puzzling things are characterised by their normally very puzzling nature.
** Can also be puzzling.
*** Not dissimilar to puzzling things.