TIME / MIND 铜币

Scene:
A square macro photograph of an antique brass challenge coin on a dark neutral tabletop, lit by low raking light so embossed relief and tiny scratches are visible. The camera is straight-on above the coin. The coin has no outer inscriptions; only the central raised ambigram is readable. A faint rotated shadow below the coin hints at the 180-degree verification.

Subject:
The central relief must read exactly "TIME" when upright and exactly "MIND" when rotated 180 degrees. Use heavy Roman capitals fused into one rotational ambigram, with carved counters, raised bevels, and shared stems. The word should sit inside a simple circular border and compass-like geometric grid, but the border itself must be abstract and contain no letters or numbers.

Important details:
This image tests text rendering under relief, wear, and metal lighting. The letters must be readable through physical form, not printed black ink. Show realistic brass patina, small edge nicks, polished high points, shadowed recesses, and consistent embossing depth. Keep the ambigram large and centered. The coin should look like a serious typographic artifact, not a fantasy medallion full of random symbols. Avoid decorative marks that could be mistaken for extra characters.

Use case:
Ambigram Readability single study 8/8, testing embossed dual-word readability where TIME rotates into MIND on a metal coin.

Constraints:
No readable text except the specified ambigram words "TIME" and "MIND", no watermark, no logos, preserve exact 1:1 aspect ratio, no date, no serial number, no outer motto, no extra glyphs resembling letters, no flat overlay text, no illegible corrosion covering the word.