Grizzly Bear is a font family of twelve that was designed to create unique titles on the fly. Special attention was given to kerning and trapping to ensure that these fonts work together as a titling system and line up perfectly when layered. An example would be how the inline fill was designed to place under the inline font as the glyph dimensions are shy around the edges to ensure that no fill edges of the under layer show. Flipping these layers would give you an outlined font. The all caps font features a higher x height in the uppercase, a lower x-height in the lower case, alternate punctuation and a few alternate glyphs added in for a good measure.
via Design Work Life