Home▸Data Science▸Truncated Axis Illusion

📊 Truncated Axis Illusion

Drag a Y-axis truncation slider on a two-bar chart and watch the SAME underlying values morph from looking nearly equal (honest zero-baseline) to one bar towering over the other (aggressively truncated axis) — with a live visual-ratio vs true-ratio readout.

Data Science2DEasy60 FPS

⚙ Under the hood

Drag a Y-axis truncation slider on a two-bar chart and watch the exact same underlying values morph from looking nearly equal (honest zero-baseline) to one bar dramatically towering over the other (aggressively truncated axis) — with a live visual-ratio vs true-ratio readout exposing the deception.

data visualizationbar chartmisleading chartsnon-zero baselinestatisticsinfographicschart literacy

2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install