This study has explored the construct of aesthetic relational knowledge (ARK) as the intuitive experience of the therapist that emerges from the phenomenological field created in a meeting between therapist and client. A scale to measure this construct has been built and validated. The concept of ARK has been examined in literature and a questionnaire has been developed, composed of 58 items. A sample of 94 Italian Gestalt psychotherapists (Mage = 40.19, SD = 8.15) has completed an online protocol containing the Basic Empathy Scale, the Multidimensional Assessment of Interoceptive Awareness, and a series of questions created ad hoc for the assessment of resonance. Two exploratory two- and three-latent-factor analyses were conducted to identify the variables that best explain ARK. The results have shown that ARK is described by three factors: empathy, resonance, and bodily awareness. They show the best saturation values and the best comparison with the theoretical reference model. Cronbach’s alpha is .844. The ARK can be defined as a three-dimensional construct that supports the positive use of counter-transferential feelings in terms of aesthetic knowledge of the phenomenological field of the therapeutic situation. The ARK can be measured by the Aesthetic Relational Knowledge Scale, suitable for training purposes, supervision, and research.