Receiving user input. A method includes displaying a set of characters arranged sequentially in a curvilinear or linear fashion such that any one of the characters in the set of characters can be identified for selection by continuous and uniform user input from a user. The method further comprises displaying a plurality of the characters in the set of characters in a fashion where each given character in the plurality of characters is displayed at a level of prominence determined by a probability that the given character is a next character in a string of characters selected by a user. The method further includes receiving user input in a continuous and uniform fashion from a user to identify a character in the set of characters. The method further includes receiving user input selecting the identified character. The method further includes adding the identified character to the string of characters.