Caltic-Holiday, Caltic-Festival, and Caltic-Straight are three eye-catching, very bold typefaces that are suitable for posters and signage. Caltic-Holiday and Caltic-Festival base letter shapes on trapezoids with curved sides but with curves that are reversed going from one to the other. Caltic-Straight has letters based on trapezoids with straight sides. None are suited for text and with their built-in spacing will not work as all upper-case or all lower-case. All three come in two widths, regular and wide, giving the Caltic family six members.
Caltic has nothing to do with Celts. The Calt refers to the calt or contextual alternative OpenType feature that makes this typeface work. When the letters on the upper-case keys alternate with the letters on the lower-case keys, they fit snuggly together. As long as the user has a word processor that supports the contextual alternatives feature, there is no need for the user to alternate letters; the calt feature does it automatically.
Although the fonts seem similar to hand-drawn lettering that was done on posters and signs during the hippie era of the 1960s and 1970s, I can find nothing quite like them. My inspiration for them is older, in a newspaper from 1932 that led to the typeface family PoultySign. Caltic (and Lentzers) are the result of seeing what else I could do with the inspiration that sprang from that 1932 newspaper.