Synthesized answer
The practical implications of "On Lisp" center on its core concept of using Lisp macros to build problem-specific languages [Passage 1]. This "bottom-up programming" style allows programmers to solve problems by creating a language that makes discussing the problem easier [Passage 1]. The book specifically details Common Lisp macros and their applications, demonstrating this approach [Passage 1].
While the passages highlight the method of bottom-up programming and the importance of macros, they do not elaborate on other specific practical implications beyond this core idea.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: On LISP by Paul Graham Description: The title itself, "On Lisp", is a reference to the idea that you can solve a programming problem by first building a programming language that lets you talk about your programming problem easier. In Lisp the programmer builds this problem specific language on top of Lisp itself using basic Lisp constructs called "macros". This style of programming is called "bottom-up programming". On Lisp is especially known for the complete description of Common Lisp macros and their uses, but the book also covers many other aspects of bottom-up programming in…