Cognitive scientist Lera Boroditsky, one of the pioneers of research into how language manipulates our thoughts, has shown that English speakers typically view time as a horizontal line. They might move meetings forward or push deadlines back. They also tend to view time as travelling from left to right, most likely in line with how you are reading the text on this page or the way the English language is written.

This relationship to the direction text is written and time appears to apply in other languages too. Hebrew speakers, for example, who read and write from right to left, picture time as following the same path as their text. If you asked a Hebrew speaker to place photos on a timeline, they would most likely start from the right with the oldest images and then locate more recent ones to the left. 

Mandarin speakers, meanwhile, often envision time as a vertical line, where up represents the past and down the future. For example, they use the word xia ("down") when talking about future events, so that "next week" literally becomes "down week". As with English and Hebrew, this is also in line with how Mandarin traditionally was written and read – with lines running vertically, from the top of the page to the bottom.

This association between the way we read language and organise time in our thoughts also impacts our cognition when dealing with time. Speakers of different languages process temporal information faster if it's organised in a way that matches their language. One experiment, for example, showed that monolingual English people were quicker to determine whether a picture was from the past or the future (represented by science fiction-style images) if the button they had to press for the past was to the left of the button for future than if they were positioned the other way around. If the buttons were placed above or below each other, however, it made no difference.