Self-Constructing Building Blocks

Origin
Wooden blocks are a staple of any nursery. Children love to assemble them. Child psychologists have linked playing with blocks to several developmental milestones.

Effects
The blocks will move themselves and form interesting structures if left alone. A favorite configuration is a castle. If left alone overnight the blocks will grow until the construction project is life-sized.

While the structures may be quite large they are not held together by mortar, so they are not to be climbed upon without care. If left out the blocks must be periodically scattered to avoid the project finishing and therefore growing.

The bag and the blocks are part of the same artifact and the bag acts as the neutralizing agent, nulling the effects of the blocks. To neutralize the blocks one needs only to neutralize the bag.

Collection
Collected by Myka from a preschool. The school called the authorities after it was discovered that an actual castle made of blocks was found in the backyard playground. Myka was able to neutralize the artifact before the castle toppled due to wind.