Which characteristic is NOT considered spatial in a control interface?

In the context of control interfaces, spatial characteristics refer to attributes that relate to the physical dimensions and arrangement of interactive elements. These characteristics influence how users interact with devices, particularly those with limited mobility, as they often rely on spatial aspects to effectively engage with control interfaces.

The weight, shape, and size of targets are all directly related to spatial considerations. For instance, the size of targets influences the ease with which a user can activate them, especially for individuals with dexterity challenges. The shape of targets may affect the accuracy of selection, while the weight of targets can determine how easily a user can engage with them if they need to move or press them.

In contrast, durability of switches does not relate to the spatial attributes of the control interface. Durability pertains to the material integrity and longevity of the interface components, which is more about the functional quality and resilience rather than their spatial dimensions or arrangement. Therefore, durability stands out from the other options, as it focuses on performance over space-related characteristics.