Modern or abstract artwork sometimes calls for a crisp and clean presentation. Artwork can be top-mounted in order to show the very edges of the work. In that case, spacers are used under the lip of the frame to make sure the surface of the work is not in contact with the picture glass. Alternatively, a second mat can be used to provide that space. As always, museum glass is the best option to reduce glare, protect the art, and increase clarity.