When I asked an artist friend why he put a dash of orange paint in a particular spot - he replied, "Because it is unexpected". He then proceeded to explain how the unexpected can enliven a painting and stop it from being boring and predictable (don't get me wrong - there was orange elsewhere in the painting so it "read" as a whole). So I am curious as to how other gardeners have used the element of surprise/unexpectedness in their own garden or have observed it in the gardens of others.