Art can serve a purpose in religious buildings simply in the architecture itself. Also, art can be a constant reminder of one's religious beliefs.
Joachim Patinir<span>, a Flemish Northern Renaissance painter is considered the first Western artist known to have specialized in landscape painting; a pioneer in this genre, however his landscapes are not a separate subject but supported by religious themes.</span>
Binders used for watercolor paints commonly are natural gum or synthetic glycol,
tempera is usually glutinous material such as egg yolk
