These things are true. The sky is a color we call blue in English; the leaves are a color we call green in English; and the bark is a color we call brown in English. So, if those things are true, then there are some things that are true. And, if there are some things that are true then there are some things that are not. The color of the sky in the photograph is not called by the color name brown.
What else is true that we have ignored?