Projection screen and greenhouse: what they have in common

1. Step 1. Projection screen — is part of — Camera obscura. The surface on which the image is seen.
2. Step 2. Camera obscura — evolved into — Camera. A camera is a camera obscura with a light-sensitive layer.
3. Step 3. Camera — includes — Thermal camera. A thermal camera is a camera that sees heat instead of light.
4. Step 4. Thermal camera — uses — Infrared radiation. Heat radiation.
5. Step 5. Infrared radiation — is used in — Greenhouse effect. Infrared radiation is trapped.
6. Step 6. Greenhouse effect — is used in — Greenhouse. Glass lets light in and holds heat.

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