Regarding my previous posts about time-axis, Tadashi Kobayashi has pointed out that the design of temporal orientation, i.e. time-axis, is in fact specified in an ISO standard. The standard orientation should be left-to-right to indicate time progress.

ISO 1503:2008
Spatial orientation and direction of movement — Ergonomic requirements

Abstract

ISO 1503:2008 sets out design principles, procedures, requirements and recommendations for the spatial orientation and direction of movement of controls and displays used in tool machines, industrial robots, office machines, earth‑moving machinery, transportation (automobiles, railway electric cars/rolling stock, aircraft, ships, etc.), information, daily commodities, public utilities and the operational components of building facilities.

It lays down basic requirements for determining the operating direction of controls and the moving directions or changing states of the target object, as well as other relations.

Thanks to Mr. Kobayashi for the information. Unfortunately, since I do not have access to this ISO paper, there is no way I could verify and find out further information about the standard of spatial orientation. Hopefully the Flickr crew, as well as other UI developers will find this information useful.

More observations on time-axis orientation in different desktop and web applications:

• [1][2] Browser has a long tradition of associating left to back and right to next. Since the first graphical UI browser Mosaic, this convention has been one of the golden standards of all browser implementations.
• [3] financial charts, business reports, scientific research results and many time-based charts use left-to-right to show time progress. The latest data is always appended to the right.
• [4][5] Music player, video player, media player…etc also associate right-pointing triangle to play, as well as doubling the triangle to indicate fast-forward.
• [6] Time Machine in Macintosh OS X. This one is a little interesting as they use a 3D model or Z-axis to show the dimension of time. I think this design is just to take advantage of the powerful 3D rendering engine in OSX rather than necessity.

This post is related to my original observation to Flickr’s new UI change, which flipped the Older/Newer orientation of the thumbnail row from their previous design. See the post Flickr New Interface, Time-axis Orientation.