# Concepts The Intangible-specific abstractions that the rest of the docs assume you know. Read these once and the feature pages get a lot shorter. ## Start here * [Projects and scenes](/overview/concepts/projects-and-scenes.md): how a project is structured – scenes as locations, shots as time. * [The three modes](/overview/concepts/the-three-modes.md): Build, Compose, Visualize – what each owns and why they're separated. * [How the visualizer thinks](/overview/concepts/how-the-visualizer-thinks.md): semantic 3D, the multi-agent system, why prompts get built from the scene. ## Building blocks * [Populators](/overview/concepts/populators.md): the procedural environment generators – Houdini for normal people. * [Image reference](/overview/concepts/image-reference.md): how a reference image attached to an object reaches the model. * [Animation and shot time](/overview/concepts/animation-and-shot-time.md): why animated movement belongs to a shot, not to a scene. ## Cost * [Credits and tokens](/overview/concepts/credits-and-tokens.md): what every action costs and how to read the counter. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://help.intangible.ai/overview/concepts.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.