That guitar part always feels like a cozy late-night campfire song to me — here's how I break 'Imagination' down so it works on a basic acoustic, plus some ways to spice it up.
Start with the chord shapes that sound great with this tune: Em (022000), C (x32010), G (320003) and D (xx0232). A really playable progression that fits most of the verse/chorus is Em — C — G — D. Count it in 4/4: each chord can last one full bar (four beats) for a simple arrangement, which gives you a gentle rolling feel. If you want the recorded-key vibe when singing along, try a capo on the 2nd fret and play the same shapes; it brightens things and keeps the chord shapes easy.
For strumming, I like a relaxed pattern that blends movement with space: down, down-up, up-down-up (D, D-U, U-D-U). Accent the
first down of each bar and lightly palm-mute the string hitting on beat two for a percussive thump — Ed often uses that little rhythmic push. If you prefer fingerstyle, a nice arpeggio for Em is: thumb hits the low E (6th string), then pluck the 4th string with your index, 3rd with middle, 2nd with ring, then back — this creates a lullaby-ish loop that suits the son
G. Add tiny hammer-ons and subtle slides on the B string to taste; they make a simple progression sound lived-in.
If you want a slightly richer texture, swap in D/F# (200232) where the progression moves G to D — sliding that low note gives forward motion. Work slowly: practice the Em to C shift very deliberately because that’s where people often fumble. Record yourself on your phone and listen for whether the bassline is steady and whether the vocal fits the capo choice. Above all, focus on dynamics — pull back on the strum in verses, push a touch in the chorus, and throw in a palm-muted chunk or two between lines for drama. Play around with these touches and you'll have a version that feels honest and singable; I always end up smiling when the groove clicks.