Remember these grids? Old fashioned graph paper. This one, in particular, is a bit of historical artifact, made by the drafting instrument and supplies company, Keuffel and Esser. Calculators and computers basically made the products of K & E obsolete. (Besides graph papers, K & E also made drafting tools and slide rules.) How ironic this antique should now find use as a WPC image.
Click This, TAPG! 
Oh my, sadly I DO remember this stuff. Ugly memories of some tedious assignments thankfully long past!! Great choice.
LikeLiked by 1 person
Oh my, too. Did not mean to bring up painful memories. Thanks, though, for liking the choice in spite of the those remembrances.
LikeLike
simplicity -Yah
LikeLiked by 1 person
Yea, KISS photography. Thanks!
LikeLiked by 1 person