Modular ergonomic goggle

A head mountable display (HMD) comprising:

• a display unit;
• a facial engagement removably coupled to the display unit and configured to fit the HMD to the user's face;
• a first securement configured to removably couple to the display unit and provide the HMD in a first form factor or use;
• and
• a second securement, different from the first securement, configured to removably couple to the display unit and provide the HMD in a second form factor or use.

An electronic display device comprising:

• a display unit;
• a facial engagement configured to engage a face of a user;
• a first securement and a second securement, each of the first securement and the second securement configured to secure the electronic display device to the user's head to set a form factor or a use of the electronic display device, the first securement and the second securement each setting a different form factor or use of the electronic display device;
• a first coupling to removably couple the facial engagement to the display unit;
• and
• a second coupling to removably couple the first securement and the second securement to the display unit.