Thanks so much for your feedback -- and suggestions. I'm submitting a revised design with the "arrow" in a horizontal position. I played around with various methods of further suggesting the arrow and settled on what I'm showing you here. I really like the way the gray "shadow" reinforces the process of solving a problem or completing a task: Up and down, up and down, that sinking feeling that it's not going to pan out then BOOM, you've done it! Hope you like -- let me know if you'd like to see any additional changes.
Cheers!
(There are two versions, the difference being the shade of gray used for the shadow.)
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