Why do people put up flowers? No skill (I think...?) involved in getting a bouquet and putting it a vase on a table. Or buying (not creating) art. Some people just like the look and it;'s hard to argue about taste.
If people have a Lego set on display, that is surely a conversation starter for me. Especially if it's a ginormous Minas Tirith or Sagrada Familia set, or an old Technic set.
Not for everyone I suppose.
I have shelving behind me that gets a lot of conversations between the Lego Architecture and bonsai and botanicals.
My partner likes a lot of the botanicals in our living room, on top of speakers, etc. The table has a vase with bouquet. That's our agreement, architecture and other things (Lighthouse, Jazz Quartet, Ship in a Bottle, Grand Piano are my favorite) in my office, botanicals in the living room.