An alteration to the traditional capo which, rather than fretting all strings on a particular fret will only hold the strings you select. This allows you to have a chord in the open position, without affecting your usual box and barre shapes further up the neck, allowing for some nifty new chord voicings.
It’s clear that, by design, you’re expected to hold open chords like Em, A, and other simpler ones, but with some finagling it was easy enough to get some 2-string chords like G and D. You can see me experiment with this and other ideas in the video below.
You can buy your very own Spider Capo right here: Link!