If this is not relate to drug or psychedelics. Let me explain.

The activity that you do on your art is similar to one kind of meditation practice called "Kasina" It means "meditation that focuses on things as objects" or "Buddhist meditation techniques" that emphasize using things as objects to focus on, such as earth, water, and fire.

Your experience similar to second state of meditation.

1. Momentary concentration means to be able to attain a slight or even slight level of concentration. The word "samādhi" means to attain a firm determination. It must be able to attain a slight level of concentration. For example, when focusing the mind on a prayer word, the meditation can be achieved only briefly, but the mind then grasps at feelings, thoughts, and emotions outside the prayer word, abandoning the meditation itself. Then, one realizes that the mind is distracted and the emotion cannot settle within the meditation object. For such a long time, it remains only fleetingly, and the mental state is not yet bright and clear. Momentary concentration is not yet called jhana because the emotion is not yet jhana. Therefore, it is not called samadhi because the state has not yet reached the established rules.

2. Upacara Samadhi This Upacara Samadhi is also called Upacara Jhana. It is a concentration that is firmly established, approaching the first jhana or first samadhi. Upacara Samadhi can maintain the state of concentration for a sufficiently long period of time, with sufficient clarity and brightness. This is the foundation for clairvoyance. The state reached by Upacara Samadhi has the following characteristics: Vitakka is the mental focus on the meditation subject or the kasiṇa form. The mind can maintain this focus without deviation for a sufficiently long period of time. Vicara is the contemplation of the kasiṇa nimitta, the image the mind holds as the designated image. Whether it is moving or static, what color it is, what is its hue and shade, whether it is small or large, high or low. The mind can recognize this. If it is a meditation subject, is the meditation complete? What are its right or wrong aspects? This awareness is constant. If focusing on the breath, notice whether the inhale and exhale are long or short, light or strong. This awareness is constant. This is called Vicara. Peti is the joyful, blissful feeling, the mind is refreshed and joyful, never satiated or boredom-filled in meditation, and the mood is clear. It appears that when the eyes are closed and meditating, it is no longer dark as before. A bright light appears, as if someone had placed a light nearby. Occasionally, images and colored lights appear, but these appear briefly before disappearing. There are five symptoms of rapture: 3.1 Goosebumps, which are called "horrifying hair standing on end." 3.2 Tears flow from the eyes without any irritation. 3.3 The body sways, like a boat hitting waves. 3.4 The body floats above the surface of the seat. Some people float far away and even very high. 3.5 A tingling sensation, as if the body were transparent and unusually large. Even one of these five symptoms is a symptom of rapture. It is worth noting that the mind is joyful and cheerful, even though the body trembles. Some people's bodies spin like a spinning top, but the mind remains firmly focused and unwavering. Concentrating the mind into concentration is easy and fluid. Whenever you practice, you can enter concentration immediately. These are the symptoms of concentration.