I must admit that a camera or a cello can be boring when compared to kids.
They don't bring home the flu, gastro or the common cold. They don't get dirty by themselves. They don't spill grapejuice all over the sofa...
But on the other hand, they don't giggle and laugh. They don't say stupid things that make you smile. You can't show them stupid tricks. You can't put them to bed and kiss them goodnight. They don't give you the chance to become a superhero by chasing the monster under the bed. They don't help you with tools when you do plumbing. You can't teach them to build a pinhole camera. You can't teach them how to ride a bike....
When you think about it, cameras and cellos can be quite boring in a way.