I think the trouble people are having is the difference between a single arbitrarily defined measurement and the relationship of that measurement to physical processes.
For example, we could ditch the hour and instead have the grolok. It so happens that there are 15 groloks in a day. However...
That might explain why I often trip over when walking down the road. I thought it was me being clumsy, but it's invisible aliens getting in my way. At last, something to blame other than myself.
Please give it a rest. Utter tosh on both counts (by the way the visible spectrum is less than 0.005% of the total spectrum) and totally irrelevant to boot. Nothing 'exists' in a specific range of the electromagnetic spectrum, and humans have spent the past 100 or so years working across as...