This question was inspired by the question "Does using a Spell Scroll always include a verbal component?"
Here is Jeremy Crawford's ruling on the components for a spell cast from a spell scroll:
Spell scrolls follow the normal rule for casting a spell from a magic item: you don't need to provide any components to cast the spell (V, S, or M). Spell scrolls have a twist, though: you must read the scroll to cast its spell. This is effectively an ad hoc component.
Does this mean that as long as I'm able to read the scroll (and touch it) - regardless of whether I'm holding it or not - I'll be able to cast from the scroll?
Consider the following scenario:
I have the scroll strapped on my back, and I have an arcane eye watching my back (the scroll). I will be able to read the scroll, and physically touch the scroll.
Can I activate the scroll this way?