A Number 7 in a Mysterious Orb

The photo below shows a mysterious orb I photographed indoors on October 11, 2017.

Note the number 7.  If you do a Google image search for "number 7" you will see several examples of fancy number 7's that look like this, with 3 lines segments rather than 2.

This is the third time I have got a number 7 in a mysterious orb I photographed. Below is a photo I took on September 6, 2017.

Below is a photo I took on July 9, 2016, as posted here:

The repeated "7" pattern is one of of 24 recurring patterns I have noticed in mysterious orbs I have photographed. The grid below summarizes each of these patterns, and how many times each have been photographed. Click here to see multiple examples of each of these patterns.