Two eighth notes,
one quarter note rest

½ beat, ½ beat,
one beat

About 94% of all the music on this planet is constructed on the binary division.
The style of music has some influence, jazz, for example, is mostly ternary.

Notes on the upbeats have an inferior rhythmical weight compared to those on the beats.

If you associate this to the inequality of the beats we have already seen,

this creates a grid of consecutive strengths that repeats itself at every bar.

Approximative grid of rhythmical weights