 SCP-640 is a free-roaming sentient electromagnetic phenomenon, typically manifesting as several roughly circular spots of yellow-orange light, between 18 and 57 mm in diameter, depending on the entity's current appetite and energy level. SCP-640 has disguised itself as spots of sunlight shining on a wall, typically inside a child's room. It generally fades from view, presumably by shifting into the IR-RF range, when closely investigated. SCP-640 is carnivorous. While it is capable of deriving sustenance from all known Earth animals, SCP-640 shows a marked preference for humans and apes, especially children.