Jay

Kazuki, you mention the rule of perspective, part of this rule is to have the tallest tree be the one with the biggest trunk and then on down. Your three trees are the opposite. When they start to grow you may want to think ahead and plan for them to change. Either keep the tallest at its present height and have the shortest grow taller of somehow change the heights. The middle tree should remain the middle height.

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A Bonsai student living with his trees at N 44.37 W 77.49...
Think before you act... then think again... no good comes from rushing