One workday.
Several worlds.

Solid marks show supported intervals. Hatching shows uncertain timing. At coarse scales, bins count records whose possible support overlaps each bin; these counts are not additive.

• Hover to inspect; drag to scrub; click a mark for its source.
• Pin the needle to read without hover updates.
• Focus the ruler: arrows scrub, Shift + arrows pan, +/− zoom, Space pins, Escape unpins.
• Ctrl + wheel over a plot zooms; Shift + wheel pans.
• Solo, mute and opacity affect the workspace, not source records.
• Overlay compares temporal extents, not incompatible numeric units.

The deep-time lane contains synthetic coordinate tests, not a history of the universe. Numeric coordinates use BigInt, not JavaScript Date.

This offline reference build supports proleptic Gregorian dates, fixed numeric offsets and bounded uncertainty. It does not implement arbitrary calendar conversion, leap seconds, live ingestion, server moderation or a million-record performance benchmark.

Local saves contain unencrypted text metadata. Uploaded images remain in this browser session only. Public lens export excludes private lanes and all uploaded artifacts.