But I know that one and one is two ...

Don't know what a slide rule is for
But I know that one and one is two
And if this one could be with you,
What a wonderful world this would be

I was composing an image with amongst other things a slide rule for a Flickr challenge and thought of this song for Silly Saturday :-)

In honour of and with fond memories of admirer/Willemien. With thanks to deanne_pearce for hosting this month !

Thanks very much for the kind comments, stars and even hearts for my little field of flowers yesterday