Perception is also important for how the Invested Arts interact with the three Realms. What a person thinks they can do often limits what they can actually do. For example, Shallan required ten heartbeats to summon Pattern as a Shardblade, despite him being a living blade. Perception makes using a soulstamp on an object easier or more difficult. The more an object is viewed as a whole, the easier it is to soulstamp. Perception of an object can and does change over time. As an object changes owner or various ingredients are combined into a whole, people’s perception of the objects change. The transition does not happen instantaneously. There will be a period of time when the line is fuzzy and multiple perceptions of an object can be true.