User interface system

A user interface comprising:

• a substrate comprising an attachment surface, the substrate partially defining a cavity adjacent the attachment surface and defining a fluid channel fluidly coupled to the cavity;
• a tactile layer comprising a deformable region and an undeformable region, the undeformable region of a first thickness and coupled to the attachment surface at an attachment point, the deformable region disconnected from the substrate and including a portion of a second thickness different than the first thickness, the tactile layer defining an outer tactile surface opposite the substrate;
• a displacement device configured to displace fluid through the fluid channel and into the cavity to transition the deformable region between:
• a retracted setting defining a first tactile formation at the tactile surface, wherein a portion of the deformable region extends into the cavity and;
• and
• an expanded setting defining a second tactile formation, different than the first tactile formation, at the tactile surface, wherein a portion of the deformable region is elevated out of the cavity;
• and
• a touch sensor coupled to the substrate and configured to detect a user touch on the tactile surface.