Greetings Charys,
I am not really sure this is helpful after soo many helpful and enlightening posts, especially in various dimensions.
...
But I thought that perhaps the Lord is trying to make you aware of something that you see as not being comprehensible; bringing a resolution to a mystery [finishing a puzzle] that you have had. Something that you cannot do on your own [which seems much to difficult for you to do that you feel you need help] and need the third dimension as a whole to balance and finish the puzzle; or mystery.
I see the 3 dimensions here as the Father, Son and Holy Spirit as a whole Being [but 3 different dimensions; a mystery]. Where exactly that fits into bringing something to your attention... the Lord knows.
The object just seems to be a demonstrative of a puzzle in a physical form to make a point... just as Christ spoke in parables.
In the most simple and basic example here of the aspects of our Heavenly Father and Creator of all things as one Being;
God the Father; Creator of all living things, and all things that exist.
God the Son; Physical manifestation of God, Servant of the Father, Redeemer, Righteous Judge.
God the Holy Spirit; Spiritual manifestation of God; Spiritual presence of God with man; Revealer of the mysteries of God.
Maybe what is said here is that you cannot "figure" out the puzzle by "thinking" with the mind.
However, in context of your puzzlement "trying to understand behaviour and how people change" there are many aspects to what causes people to change has a lot to do, in my opinion, primarily with 1. A person's spiritual condition. 2. Their faith and confidence in their salvation. 3. Their experiences; wisdom gained or wounds obtained.
Simply put...
Amazing how difficult it is to say a simple thing, lol. I know I have not done any grace in my attempts here... I still hope it helps!
May God reveal His this mystery in your dream and continue to bless the works of your hands.