Every couple of hours I post a GIF of double pendulum released from a random position to swing for 30 seconds.

Earth's gravitational field
Joined February 2018
1000th tweet celebrations!! - 10 pendulums - 1/1000 kg of mass difference - 1/1000 mm of length difference
14
355
85
1,720
Initial conditions: Pendulum 1: position: (-1.24, 0.80), mass: 5.80 Pendulum 2: position: (2.68, 1.87), mass: 5.17
3
6
5
58
8,456
Initial conditions: Pendulum 1: position: (2.19, 1.34), mass: 2.83 Pendulum 2: position: (2.63, 0.98), mass: 3.38
2
7
2
51
5,514
Initial conditions: Pendulum 1: position: (0.52, 1.48), mass: 5.43 Pendulum 2: position: (4.06, 1.06), mass: 1.95
1
4
2
45
3,733
Initial conditions: Pendulum 1: position: (-3.87, 0.46), mass: 4.64 Pendulum 2: position: (5.54, 0.30), mass: 1.75
1
3
2
36
4,080
Initial conditions: Pendulum 1: position: (1.77, 2.60), mass: 1.31 Pendulum 2: position: (-5.20, 3.20), mass: 1.82
2
4
45
3,390
Initial conditions: Pendulum 1: position: (-1.96, -0.30), mass: 5.00 Pendulum 2: position: (2.94, 4.47), mass: 5.70
1
3
1
41
3,758
Initial conditions: Pendulum 1: position: (0.40, 2.25), mass: 4.10 Pendulum 2: position: (-2.64, -1.13), mass: 4.17
2
4
48
3,200
Initial conditions: Pendulum 1: position: (4.00, 0.71), mass: 5.62 Pendulum 2: position: (0.86, 0.61), mass: 1.33
2
2
29
2,766
Initial conditions: Pendulum 1: position: (-3.60, 1.00), mass: 2.26 Pendulum 2: position: (-3.50, 2.64), mass: 4.82
1
6
44
3,205
Initial conditions: Pendulum 1: position: (0.20, 2.65), mass: 2.68 Pendulum 2: position: (-2.21, 3.65), mass: 1.81
1
6
70
4,249
Initial conditions: Pendulum 1: position: (3.30, 0.55), mass: 3.76 Pendulum 2: position: (2.77, 2.35), mass: 3.00
2
3
33
3,810
Initial conditions: Pendulum 1: position: (-2.29, 0.79), mass: 1.96 Pendulum 2: position: (-1.37, 0.86), mass: 1.84
4
4
1
37
4,984
Initial conditions: Pendulum 1: position: (-3.93, 0.05), mass: 3.73 Pendulum 2: position: (-1.13, 3.41), mass: 1.64
2
12
86
6,287
Initial conditions: Pendulum 1: position: (-0.09, 0.87), mass: 4.38 Pendulum 2: position: (-0.57, 3.36), mass: 3.75
1
20
4
126
6,889
Initial conditions: Pendulum 1: position: (-0.14, 0.39), mass: 3.80 Pendulum 2: position: (-3.75, 2.21), mass: 1.48
2
9
1
82
5,380
Initial conditions: Pendulum 1: position: (-0.01, 3.09), mass: 4.10 Pendulum 2: position: (-3.17, 2.30), mass: 5.36
1
11
7
94
7,957
Initial conditions: Pendulum 1: position: (1.26, 3.13), mass: 3.25 Pendulum 2: position: (3.98, 4.02), mass: 3.36
1
12
5
92
17,562
Initial conditions: Pendulum 1: position: (3.85, 1.15), mass: 2.53 Pendulum 2: position: (-5.67, 1.39), mass: 3.51
3
8
1
54
3,933
Initial conditions: Pendulum 1: position: (-0.78, 2.84), mass: 5.61 Pendulum 2: position: (-2.01, 4.30), mass: 3.72
1
9
1
60
4,352
Initial conditions: Pendulum 1: position: (-3.29, 2.73), mass: 5.53 Pendulum 2: position: (0.39, 2.67), mass: 3.10
1
3
1
30
3,132