ET.

Visual field guides · 01—07

Technology, made visible.

A curated library of interactive explanations for systems that are easier to understand when you can see the parts move together.

01

5 min · Bluetooth · Proximity · Radio

BLE Beacons

Tiny radio lighthouses

A visual field guide to how Bluetooth Low Energy beacons broadcast, how phones interpret them, and why signal strength is only a clue to proximity.

Open field guide
02

8 min · ShazamKit · iOS · Media Sync

Audio Sync with ShazamKit

Headphones that follow the room

A system guide to recognizing a video playing in a room, recovering its current timecode, and keeping personal dubbed audio aligned on an iPhone.

Open field guide
03

7 min · AI Agents · Workflows · Context

AI Agent Skills

Reusable expertise on demand

A visual guide to how skills package instructions, references, assets, and scripts—then load the right expertise only when a task needs it.

Open field guide
04

8 min · AI Agents · MCP · Distribution

AI Plugins

Installable capability systems

A visual guide to how plugins package skills, MCP tools, authentication, and optional UI into capabilities people can discover and install.

Open field guide
05

8 min · AI Agents · MCP · Tools

Model Context Protocol

One language for AI capabilities

A visual guide to how MCP lets AI hosts discover tools and data from many independent servers through one shared protocol.

Open field guide
06

8 min · AI · Retrieval · Embeddings

Retrieval-Augmented Generation

Give the model an open book

A visual guide to how RAG indexes source material, retrieves relevant passages, and grounds a generated answer in supplied evidence.

Open field guide
07

9 min · Voice · Realtime · Streaming

Realtime Voice AI

A conversation carried by events

A visual guide to streaming speech in and audio out while turn detection, interruption handling, tools, and latency shape the conversation.

Open field guide