Quote - I think it's that way so the movement matches the orientation of  the doohickeys....

 

doo·hick·ey [ d hìkee ] (plural doo·hick·eys)

noun    Definition:   doohickeys -a technical term first used by Brycers to describe the miscellaneous tools in the program.  Thingamabobs, whachamacallits and other such non-technical terms, are similar but are not to be confused with the technical attributes of a doohickey. [Late 20th century. Blend of "do what?" + "hickey"]

:)
BT