A device having a deformable surface, the device comprising: - a compliant material member, having a volume; - a plurality of electroactive polymer micro-particles having a maximum outer extension of less than 100 μm, and being dispersed within the volume, the electroactive polymer micro-particles being adapted to deform in response to the application of an electrical stimulus; - one or more electrode arrangements (32, 34), each operable to apply an electrical stimulus to a plural set of the electroactive polymer micro-particles; and - a controller configured to control the one or more electrode arrangements to apply electrical stimuli to the plurality of micro-particles, the stimuli being configured to induce differing actuation responses in different regions of the compliant material member to thereby effect a shape change of the compliant material member configured to cause a non-uniform deformation profile across the deformable surface, characterised in that the stimuli are configured to induce the differing actuation responses in differing regions of the compliant material member based on one or more of: i. differing electrical stimuli applied to different subsets of micro-particles within the compliant material member by means of spatially distributed arrays (40, 42) of individually addressable and individually controllable electrodes; ii. differing densities of micro-particles in different regions of the compliant material member; and iii. ordered subgroups of micro-particles of differing shapes and/or sizes within the compliant material member. - a compliant material member, having a volume; - a plurality of electroactive polymer micro-particles having a maximum outer extension of less than 100 μm, and being dispersed within the volume, the electroactive polymer micro-particles being adapted to deform in response to the application of an electrical stimulus; - one or more electrode arrangements (32, 34), each operable to apply an electrical stimulus to a plural set of the electroactive polymer micro-particles; and - a controller configured to control the one or more electrode arrangements to apply electrical stimuli to the plurality of micro-particles, the stimuli being configured to induce differing actuation responses in different regions of the compliant material member to thereby effect a shape change of the compliant material member configured to cause a non-uniform deformation profile across the deformable surface, characterised in that the stimuli are configured to induce the differing actuation responses in differing regions of the compliant material member based on one or more of: i. differing electrical stimuli applied to different subsets of micro-particles within the compliant material member by means of spatially distributed arrays (40, 42) of individually addressable and individually controllable electrodes; ii. differing densities of micro-particles in different regions of the compliant material member; and iii. ordered subgroups of micro-particles of differing shapes and/or sizes within the compliant material member. i. differing electrical stimuli applied to different subsets of micro-particles within the compliant material member by means of spatially distributed arrays (40, 42) of individually addressable and individually controllable electrodes; ii. differing densities of micro-particles in different regions of the compliant material member; and iii. ordered subgroups of micro-particles of differing shapes and/or sizes within the compliant material member.