Full, half full and empty battery in a human head. Symbol for mental energy reduction, decreasing concentration, learning time, waning success.

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Full, half full and empty battery in a human head. Symbol for mental energy reduction, decreasing concentration, learning time, waning success or negative mental mood.

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Size: 9000px × 2968px
Photo credit: © Peter Hermes Furian / Alamy / Afripics
License: Royalty Free
Model Released: No

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