Found this practice visual puzzle online. The top image is the sequence, and the bottom image (with 4 options) is the options for the final shape set in the sequence. The answer is the three black triangles. Can anyone explain the solution?
I am not sure if its correct but could be:
the second image is drawn top view of first like the top view of first rods is circle and top view of the third image can be triangle(if rod not perfectly straight or looking from an angle).
we can just consider the ends of rod; for first image its round and for third its triangle
If you see third image by half closed eyes(not sure whats the correct word) we can clearly see solid triangle!
Foreword: I will be using the terms image for each of the large squares that contain the smaller figures, and shape for each small figure within an image.
It could be that:
Each image (starting from the third onwards) has an additional number of lines to each of its three shapes, in comparison to its second previous. So, the third image has 1 more line to each shape than the first image. In the fourth image, 2 lines would be added to each circle's number of lines; the number of lines in a circle is one, and in a triangle it's three - which 2 lines were added this time.
This explanation would imply that the number of added lines increases by one on each next image; so, in a hypothetical fifth image, each shape would have 3 more lines than the third image.
Still not a perfect answer, as one could not possibly deduce the +1 line addition increment; as no previous images showcase this increment.
I could also argue that:
In the third image, these little horizontal lines are actually 2 more for each shape - instead of 1; if we think of them as being one smaller line on the left of each diagonal line, plus another one on the right. Which would make for a consistent line addition of 2 each time. But I couldn't seriously accept this as an answer; since I don't see any solid reason these little lines could not be whole.
We also can't be sure if these are actually badly drawn circles, or just octagons.