a WiFi activated house is already functioning like that but at an amoeba level.
I am not sure I understand the analogy. Can you explain please?
An interesting question!
A junior school KS2 level definition of a "living thing" would be something like: any organism, or a life form, that possesses or shows the characteristics of life, or being alive. The fundamental characteristics that are held by something being alive are: having an organized structure, requiring energy, responding to stimuli and adapting to environmental changes, and capable of reproduction, growth, movement, metabolism, and death. I remeber being taught that in school Biology lessons.
I think that is an extremely simplistic definition that does not hold up to scrutiny against all forms of what we might consider life, or to others that we consider not to be life. It might work with animals and plants, but is severely deficient on fungi, protists, archaea, and bacteria. Are viruses life? However, I don't have another definition to offer to you, so for the sake of an experiment lets use that and play around with it.
So, let's consider a WiFi activated house, where all the lights, heating and electrical appliances are blue-toothed, and there is some central processing unit, control machine with a clock, and the ability to make decisions based on environmental factors.
Does it have an organised structure? - tick!
Does it require energy? - tick!
Does it respond to stimuli and adapt to environmental changes? - tick!
Is it capable of reproduction? - not yet, but if you attached a 3D printer it could start to make copies of itself.
Is it capable of growth? - as above, it could grow in size and attach more appliances, it could also repair broken pathways. A vacuum cleaner and lawn mower could be classed as maintenance and repair, but to repair appliances and wiring then you will need more sophisticated robots than we currently have. Not impossible. - tick!
Is it capable of movement? - yes, if a plant's movement is counted as movement, then vacuum cleaners and lawn mowers move. - tick!
Does it have a metabolism? A sticking point maybe! It will run of electricity and gas, but these could be generated by solar cells and by methane recovery from garden waste biogenesis, and they could also be blue-toothed appliances that come on and off stream as required by the CPU. -tick!
Can it die? Machines can suffer the blue screen of death as much as any animal or plant can shrivel up and die. - tick!
I'd say that there is no current building at present that could be counted as a "living thing" under that definition, but that we do have the technology now to create one. I think the problem with that definition is that it doesn't include many other things that define living things:
Our ability to communicate with others - even trees talk to each other. The house could, however, use the internet and the telephone, but it would need a much more sophisticated control mechanism than Alexa or Echo.
Our ability to "self-repair" is vitally important and a house is, at the present time, unable to fix a broken toaster or TV set. It could, however, order a replacement online, or book an appointment with an engineer (not sure how it would pay for those?)