Sunlight shining through the glass window

While in class I saw the children resting in the school cafeteria, I found a reflection from the refraction of the glass window at the front of the class.

Here we can clearly see the sun shining in during the day through the glass window which forms an object that follows its original shape.

Because the incoming sunlight has begun to lean towards the middle of the day, only part of the light received from this object is visible from the two existing window objects.