Light

Light is both a natural and blockhead-made thing.

Effects
Trees grow more fruit in light. A blockhead's environment bar will tend to reduce in low light, and it will try to move around a completely unlit area.

Light can partially penetrate into solid, non-transparent blocks, allowing the player to see what's "buried" there. How far it penetrates is determined by the strength of the light. Even the strongest light (full daylight) cannot penetrate more than 4-5 blocks deep and quickly fades to black after that.

Light will illuminate the far side of solid blocks, although it will tend to be diminished more than normal for that distance.

Natural Light Sources

 * Sun, Moon, Stars
 * Magma
 * Gems
 * Chilli Plant (when mature)
 * Gold Nugget (before it is mined)
 * Time Crystal (before it is mined)
 * Ice Torch (natural because it can't be crafted)
 * Portal, Trade Portal (spawned at origin)

Artificial Light Sources

 * Basic Torch
 * Oil Lantern
 * Steel Lantern, Steel Downlight, Steel Uplight
 * Chandelier
 * Campfire, Kiln, Furnace, Metalwork Bench, Steam Generator
 * Portal, Trade Portal