Magnetic haptic system

1. An apparatus comprising:

a body, at least a portion of the body comprising one or more instances of a first magnetic material; and

a moveable element coupled to the body and separated by a distance in a first dimension from the portion of the body, the moveable element comprising one or more instances of second magnetic material, the moveable element configured to move in at least a second dimension perpendicular to the first dimension while the distance remains fixed by the apparatus, wherein:

at least one instance of the second magnetic material repels or attracts at least one instance of the first magnetic material;

at least one of the following:

the one or more instances of the first magnetic material comprise a plurality of instances of the first magnetic material, wherein each instance of the first magnetic material is separated from an adjacent instance of the first magnetic material by a non-magnetic portion of the body; or

the one or more instances of the second magnetic material comprise a plurality of instances of the second magnetic material, wherein each instance of the second magnetic material is separated from an adjacent instance of the second magnetic material by a non-magnetic portion of the moveable element;

at least one of the following:

at least one instance of the first magnetic material is offset in a direction of the first dimension from at least one other instance of the first magnetic material; or

at least one instance of the second magnetic material is offset in a direction of the first dimension from at least one other instance of the second magnetic material; and

the first magnetic material in the portion of the body or the second magnetic material in the moveable element, or both, comprises:

one or more first instances having a magnetic moment pointing in a first direction substantially parallel to the first dimension; and

one or more second instances having a magnetic moment pointing substantially opposite to the first direction.

2. The apparatus of claim 1 , wherein:

the one or more first instances comprise a plurality of first instances;

the one or more second instances comprise a plurality of second instances;

each first instance is between two second instances; and

each second instance is between two first instances.

3. The apparatus of claim 1 , wherein:

the body is substantially circular; and

the moveable element comprises a substantially circular element that is configured to rotate about the body.

4. The apparatus of claim 3 , wherein the first dimension is substantially perpendicular to a radial dimension of the moveable element.

5. The apparatus of claim 3 , wherein:

the moveable element encircles the portion of the body; and

the first dimension is substantially parallel to a radial dimension of the moveable element.

6. The apparatus of claim 5 , further comprising:

within the body, a non-transitory computer-readable storage media embodying software;

one or more processors coupled to the media;

a display coupled to the body; and

a band coupled to the body.

7. The apparatus of claim 6 , wherein the processors are operable to execute the software to:

determine a rotation of the moveable element; and

navigate, based on the rotation, among a plurality of graphical user interfaces for display on the display.

8. The apparatus of claim 7 , wherein the processors that are operable to execute the software to navigate, based on the rotation, among the plurality of graphical user interfaces comprise processors that are operable to execute the software to transition between two of the graphical user interfaces when at least one of the instances of second magnetic material passes near at least one of the instances of first magnetic material.

9. The apparatus of claim 6 , wherein the processors are operable to execute the software to:

determine a rotation of the moveable element; and

select, based on the rotation, a graphical element of a graphical user interface displayed on the display.

10. The apparatus of claim 9 , wherein the processors that are operable to execute the software to select, based on the rotation, the graphical element comprise processors that are operable to execute the software to transition between two of a plurality of graphical elements when at least one of the instances of second magnetic material passes near at least one of the instances of first magnetic material.

11. The apparatus of claim 6 , wherein the processors are operable to execute the software to:

determine a rotation of the moveable element; and

determine, based on the rotation, a value of a setting relating to the apparatus.

12. The apparatus of claim 11 , wherein the processors that are operable to execute the software to determine, based on the rotation, a value of the setting comprise processors that are operable to execute the software to adjust the value when at least one of the instances of second magnetic material passes near at least one of the instances of first magnetic material.

13. The apparatus of claim 3 , further comprising a detector configured to detect a rotation of the moveable element.

14. The apparatus of claim 13 , wherein the detector comprises a Hall-effect sensor.

15. The apparatus of claim 3 , wherein the moveable element is configured to be detached from the body.

16. The apparatus of claim 1 , wherein at least one instance of the first magnetic material or at least one instance of the second magnetic material comprises a permanent magnet.

17. The apparatus of claim 1 , wherein at least one instance of the first magnetic material or at least one instance of the second magnetic material comprises a magnetizable material.

18. The apparatus of claim 1 , wherein at least one instance of the first magnetic material or at least one instance of the second magnetic material comprises an electromagnet.

19. The apparatus of claim 18 , wherein a magnetic moment of the electromagnet is dynamically configurable by a user or by the apparatus.

20. The apparatus of claim 1 , wherein at least one first instance of the first magnetic material comprises a floating magnetic material operable to move in a direction of the first dimension.

21. The apparatus of claim 1 , wherein: the body comprises a rail; and

the moveable element comprises a slider.

22. The apparatus of claim 1 , wherein the distance is dynamically configurable by the apparatus or by a user of the apparatus.

23. The apparatus of Claim 1 , wherein the offset is dynamically configurable by the apparatus or by a user of the apparatus.

24. The apparatus of claim 1 , wherein:

at least one instance of the first magnetic material is offset in a direction of a third dimension from at least one instance of the second magnetic material; or

at least one instance of the second magnetic material is offset in a direction of the third dimension from at least one instance of the first magnetic material,

the third dimension being substantially perpendicular to the first dimension and to the second dimension.

25. The apparatus of claim 24 , wherein the offset in the direction of the third dimension is dynamically configurable by the apparatus or by a user of the apparatus.

26. The apparatus of claim 1 , wherein:

the one or more instances of the second magnetic material have a magnetic moment pointing in a first direction substantially parallel to the first dimension; and

the one or more instances of the first magnetic material comprise:

one or more first instances having a magnetic moment pointing substantially opposite to the first direction; and

one or more second instances comprising a magnetizable material that does not have a permanent magnetic moment.

27. The apparatus of claim 26 , wherein:

each first instance is between two second instances; and

each second instance is between two first instances.

28. The apparatus of claim 1 , wherein:

the body is substantially circular; and

the first dimension is an axial dimension with respect to the substantially circular body.