In 7th grade social studies, I did a report for a class project, and printed the Karateka opening screen on my apple image writer as the cover page. I got an A+ because of that cover!
MERKLE TREE
H(ROOT)
/ \
H(0-1) H(2-3)
/ \ / \
H(0) H(1) H(2) H(3)
/ \ / \ / \ / \
D0 D0 D1 D1 D2 D2 D3 D3
But that's a little too tidy to be a proper Christmas tree — so here’s a more “tree-like” version with ornaments, while still preserving the Merkle structure: H(ROOT)
/ \
H(0-1) H(2-3)
/ \ / \
H(0) H(1) H(2) H(3)
/ \ / \ / \ / \
D0 D0 D1 D1 D2 D2 D3 D3
(leaf)(leaf)(leaf) (leaf)(leaf)(leaf)
Notes (so it’s actually Merkle-y) H(ROOT)
/ \
┌────────H(0-3)────────┐
/ \
┌────H(0-1)────┐ ┌────H(2-3)────┐
/ \ / \
┌─H(0)─┐ ┌─H(1)─┐ ┌─H(2)─┐ ┌─H(3)─┐
/ \ / \ / \ / \
D0 D1 D2 D3 D4 D5 D6 D7
If you want it even more like a Christmas tree (full silhouette + ornaments) H(ROOT)
/ \
──────H(0-3)──────
/ \
─────H(0-1)───── ─────H(2-3)─────
/ \ / \
───H(0)─── ───H(1)─── ───H(2)─── ───H(3)───
/ \ / \ / \ / \
D0 D1 D2 D3 D4 D5 D6 D7
Edit: Note the emoji ornaments did not come through.