Is there a word/phrase meaning "perceptible on the timescale of human attention"?
For example, a light turning on and off once per second qualifies. A laser turning on and off at 100Hz is too fast. The movement of the sun and moon in the sky is perceptible, although barely so... you'd have to make a record of where they were (e.g. sundial) and note changes over the span of minutes. Movement of glaciers (in general) is too slow to be perceptible in this way.
Quantitatively I would put this at 10Hz - 0.01Hz, but I'm wondering if a more evocative phrase exists, since I'm looking at the qualitative/evocative aspects of it, rather than quantitative.
The sway of the trees and the movement of a clock pendulum are _____; the beating of a bee's wings and the movement of a glacier are not.