Why are chair mats in Keyshape/keyhole shape?

[KENZY9]

https://www.google.com/imgres?imgurl=https%3A%2F%2Fwww.matshop.com.au%2Fmedia%2Fcatalog%2Fcategory%2FChair-Mat.jpg&imgrefurl=https%3A%2F%2Fwww.matshop.com.au%2Fchair-mats&tbnid=7z_0WL-NmJI9eM&vet=12ahUKEwjTrJec-vT4AhWs5TgGHQCpANkQMygWegUIARC3Aw..i&docid=PHQJ37ydFNyc6M&w=552&h=552&q=chair mat keyshape keyhole grey&client=firefox-b-d&ved=2ahUKEwjTrJec-vT4AhWs5TgGHQCpANkQMygWegUIARC3Aw

[PineyCreek]

Standard desks have a shape where the posts are on either side of you when your chair's pushed in. The narrow part fits between the two legs/sections of desk for the casters that make it that far in.

 

If you don't like/need it, it's just as easy to get a full square mat.

 

Possible example:

[PineyCreek]

Noting when looking for picture examples that some show the extra notch bit (or whatever you want to call the extension) sticking off to the side or behind.  Only explanation I have for those example pictures are the people staging those mats are on recreational substances.  I guess it's all up to personal preference/environment though.

[KENZY9]

6 hours ago, PineyCreek said:

Standard desks have a shape where the posts are on either side of you when your chair's pushed in. The narrow part fits between the two legs/sections of desk for the casters that make it that far in.

 

If you don't like/need it, it's just as easy to get a full square mat.

 

Possible example:

cheers i was deciding whether to get keyholeshape or square/rectangular

anyway i still dont get why wouldnt they just get a full/squared one and put the furniture on top of the mat ... (or some other usage problem i cant think of)

[tkitch]

1 hour ago, KENZY9 said:

cheers i was deciding whether to get keyholeshape or square/rectangular

anyway i still dont get why wouldnt they just get a full/squared one and put the furniture on top of the mat ... (or some other usage problem i cant think of)

simple:  Desk feet will punch holes in the mat overtime.  Esp on carpet.