Abstraction Funnels Example: digital logic as a simple, highly reusable set of analog circuit designs

• Preserves source of much power

  • universality, parallelism

• Abstracts away distracting features

  • AC analysis, sine waves, complex numbers, ...

• In-model causality only on provided paths

  • unidirectional bit-wires

• Composability; signal interoperability

  • A bit from an ALU is good as a bit to a register