YouTube Videos: Marshall Lochbaum Outer Product as an Introduction to APL and a Pretty Cool Thing in General Dyalog'19: Implementing Reduction Presenting Seed: A Metamorphic Software System by Andrew Sengul BQN Language with Combinators: BQN: An APL Variant from Marshall Lochbaum BQN Primitives Other Links: Homoiconicity April: APL Lisp Compiler