A little infinity, in the hand.

Inside the 8 cm

Dome

80 mm hemisphere, 2.5 mm wall, on a fixed rim 100 mm across, both with the same dichroic coating as the big HELIO, or the semi-transparent mirror as the option

Mirror

Silver PMMA disc inside the LED ring, 73 mm by 0.5 mm, fully reflecting

Light

43 side-emitting RGBW LEDs on one ring facing the centre, following the SIDE43 draft; they play the big HELIO’s animations

Board

100 mm round, black solder mask, all other parts on the underside

Brain

ESP32-S3 with Wi-Fi, I²S microphone for sound-to-light, ambient light sensor

Power

USB-C charging, flat 1S LiPo, nominal 2000 mAh

Housing

Printed rim ring that holds the dome's fixed rim and twist-locks onto a base that holds the battery, with a seat ring under the rim to clear the LEDs (proposal); covered buttons, a slot for the switch, a USB-C opening under a drip hood and a cord that crosses over the battery, close to the centre of mass, and leaves through two hidden openings under the ring for wearing it; adjusted to the MINI80 board and the 80 mm dome from a design study

Board geometry from the native MINI80 model (v289), without its top-emitting LEDs; the side-emitting ring follows the SIDE43 draft. Dome and its fixed rim as measured; mirror and battery at nominal design dimensions. The housing is adjusted to the MINI80 board and the measured dome from a design study; its print clearances are still to be verified. The dichroic coating uses the big HELIO’s film model and the mirror a nominal 60% reflectance; neither is measured on a mini dome. A design visualisation, not a production release.