Sometimes a bit o' idle surfin' can get ye t' where ye di'nae realise ye wanted t' be...
Durin' a short "free period" I'd been porin' o'er some charts. Real charts. Prepare t' be boarded! Big flappy unruly Ordnance Survey paper sheets. If ye remember these thin's, ye'll remember the faff involved in foldin' 'em away neatly after use. You'll likely also remember that repeated use destroys any stressed/strained intersections o' folds.
Anyway, duty called so I put away the charts. Some DIY were bein' required, a drill were bein' necessary, an' the all-singin', all-dancin' one that I'd bought fer me Dad (so that I could borrow it permanently) were bein', fer some strange reason, at me Dad's place, on a dead man's chest! Nay matter, a detour t' the local Lidl durin' a cardio-exercise walk resulted in the acquisition o' a cheap cordless jobbie.
Back at the ranch I did the DIY an' decided that the cheap jobbie were bein' in fact quite good. So good that I looked into buyin' a spare battery-pack fer it. At some point durin' the web-search I got distracted by Wikipedia's page on Li-ion batteries an' found meself readin' about their flexibility (see here).
I got side-tracked by the Miura Fold/Solar Panel Array thing...
And then the droppin' penny reached its target.
Aye, I know 'tis been done afore, but I've a mind t' give it a try fer meself on a newish real chart once I've ironed-out all o' them there standard-issue O. S. Prepare t' be boarded! creases. I might start wi' a Memory-Map printout an' work me way up from there.
Here be a YT clip o' how it works: