Time, attention, and the things that interrupt both.
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A timer showing remaining time as a shrinking coloured disc. Time becomes a visible quantity rather than an abstraction.
What it is like to use
The strongest single recommendation on this list for time blindness. Get the silent model: the ticking version defeats the purpose for noise-sensitive people.
A shade over the top of the screen that blocks ceiling light before it lands. Solves glare rather than distraction, which is the other half of what makes a screen tiring to look at.
What it is like to use
Overhead strip lighting bouncing off a screen is a low grade drain most people stop noticing and keep paying for all day. If you squint at your monitor under office lights and have already turned the brightness up, this is the cheaper fix.
No pairing, no charging, no battery to be dead at the moment you need them.
What it is like to use
Worth stating plainly: a device that requires a charge is a device that fails on the day executive function is already gone. Wired removes a whole failure mode.