We all know that fruits of a new tree are prohibited to enjoy from, during first 3 years. Is enjoying the fruits must be physical like: eating or burning (as "השורף קליפי עורלה") or also not physical like looking?
I'm asking because in Israel sometimes Kumquats (small decorative citrus trees with fruits) are placed near entrances to building or other places, for beauty. And enjoyment from such a thing is by looking at the tree, and also by looking at its fruits. The fruits are not intended to be eaten from such a tree. However, in case looking itself is prohibited, one should avoid looking at them (or at least avoid enjoying from looking at them) until the tree would be old enough.
P.S. Once, I've heard from someone this is prohibited, but that was a speculation. So I'm searching for some sources about this issue. Thanks is advance.