Uploaded August 2023 | Updated September 2026, 3 hours ago

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At least six times Sarugaki (over at the On the Level discord server) has posted this pair of "proofs" claiming an exception to my ironclad rule: Vertical is aligned with plumb. Horizontal is perpendicular to vertical, full stop, no exceptions.

So I take it apart in this video.

0:00 Intro
1:21 Discord "discussion"
4:06 Sarugaki's diagram
5:13 Definitions and Axioms
9:24 Proof #1 (start)
10:13 Sidebar: Conditional Statements
11:34 Proof #1 (continued)
12:50 Sidebar: Proof by Contradiction
13:20 Proof #1 (conclusion)
14:21 Proof #2
15:16 Cargo Cult analogy
16:40 Closing thoughts