Freedom of expression only goes so far. How far depends on your culture and, in the case of your yard or garden, your neighbors. One current trend in the U.S is the housing development with strict covenants on the appearance of your property. This means only "approved" colors on your siding and trim, fertilized, watered and short-mowed grass (native grasses need not apply.) And no art!
I'm not in that class (yet- but there are such developments within a mile of my house.) but who knows? There seems to be a trend to vinyl siding, a poor choice in this climate, but popular with developers. I wouldn't be at all surprised to see some zealous inspector condemn my cedar shakes. They've lasted over 50 years now, most of the neighbors are on a second or third set of vinyl, steel or aluminum siding in the last 25 years. OK, I do have to paint every 7 years or so. I won't try any yard art such as the above, however- I'd be pushing my luck.