EyeStill Speed Reader

Opens text in EyeStill, a speed reader shown in the chat as an interactive view. The view shows one word at a time at a single point of focus (RSVP) on a 3D drum, with play, pause, speed (100 to 1,000 words per minute) and position controls. Takes exactly one of: url (a public web article, page or plain-text file; the server extracts its readable text), book (title and/or author of a public-domain book, fetched from Project Gutenberg), or text (any text, such as text from the conversation or an answer composed for reading in the view). Text is displayed while it streams in, so reading can start before it is complete. The text is shown only in the view; the result reports its title and word count. Plain prose reads best: Markdown, tables and code appear as raw text. A text can be opened at a word number (start_word, as reported by the reader's context) or at the first place a phrase appears, such as a chapter heading (start_at). While the user reads, the view shares the current position and passage as context.

Used by the EyeStill reader view to load the text of a page or book, or its next part.