An adult with 20 or more children to watch will say "Don't touch it" quite often. An unschooling parent might rarely need to say it, being close at hand.
As my children had examples of people being gentle with their things, and were with me when I was gentle with other people's things, it was easy for them to learn to examine objects without being rough or careless.
Learning to be kind and gentle to a child will make you a kinder and gentler person. Learning to make choices that make you kinder and gentler to a child—more generous, softer, more patient—will help you be a better partner, adult child, neighbor, customer at the grocery store.
Clutter and beauty can coexist. Seeing what's interesting can remind you that clutter can be cleaned up later, but beauty should be seen whenever possible.
When children are older, clutter can subside. Find the good parts today.