681 cm is equal to 267.72 inches.
This can be compared to the height of a standard door, which is usually around 80 inches. 681 cm would be about 3.3 times taller than a standard door.
It can also be compared to the height of a tall adult male, which is usually around 70 inches. 681 cm would be about 3.8 times taller than the average height of a man.
Another comparison could be made to the width of a standard sheet of paper, which is 8.5 inches. 681 cm would be about 31.5 times wider than a standard sheet of paper.
Finally, 681 cm is just slightly taller than the heights of the average giraffe, which is typically around 16 feet (192 inches). 681 cm would be about 1.4 times taller than the average height of a giraffe.