Answer: Flow.
Explanation:
Mihály Csíkszentmihályi is an American psychologist who has worked in the area of positive psychology and has studied mental states such as fun, creativity, and happiness. It is also known by the theory of "Flow."
According to his theory, a state of "flow" or "being in the zone" occurs when a person is focused on an activity that they enjoy, to the point that their concentration is focused on what they are doing. This state is mostly experienced when doing a creative activity.
In this case, <em>Ivan enters "the zone" when he paints with watercolors, taking his concentration level to the maximum, so he is unable to perceive how time goes.</em>
<em />
<em>I hope this information can help you.</em>