CloseTogether was designed to alternate convex and concave letter sets, with convex letters on the upper-case keys and concave shapes on the lower-case keys. The OpenType feature of contextual alternatives (calt) does this automatically. Individually some of the letter shapes are strange and unsightly. They have the shapes that they have so that they fit snuggly with adjacent letters. The family has three weights: regular, bold, and extrabold.
The letter spacing is set very tight and the user may want to loosen it by altering characters spacing. (Either the convex or concave set the letters can be used alone if the character spacing is adjusted.) The typeface has four OpenType stylistic sets of alternates, one for numbers and the others for letters D, T, and Y.