Course Provider
Door of Perception is the practice of Dorien, a Netherlands-based psychedelic guide, coach, and medical anthropologist who co-founded the OPEN Foundation in 2007 and brings over 20 years of experience in harm reduction at festivals such as Kosmicare, Zendo, and Psycare. She offers online courses for safe DIY psychedelic journeys, one-on-one psilocybin truffle sessions in Amsterdam, and training workshops for guides and mental health professionals.
Door of Perception is a seasoned, independent psychedelic guidance practice rather than a formal school. Its strongest fit is for people wanting grounded, legally framed truffle sessions in Amsterdam, plus practical support for responsible self-guided use and for practitioners entering the field. The lineage is unusually credible for a small practice, with Dorien Tatalas citing long involvement with OPEN Foundation, ADEPT, Guild of Guides membership, and harm reduction work at Kosmicare, Zendo, and Psycare.
Best for curious adults seeking a carefully prepared psilocybin truffle experience, and for aspiring guides or professionals who already have some hands-on exposure and want ethical, practical mentoring. It is less suited to complete beginners to psychedelics who want a formal, classroom-style pathway.
For guide-facing consults and masterclasses, Dorien states that applicants should already have some experience guiding psychedelic journeys, ideally several years of serious interest and around twenty personal psychedelic experiences. For truffle sessions, the practice screens for health and contraindications and only works with healthy participants; it does not take people with serious physical conditions such as heart and vascular problems or epilepsy.
Door of Perception does not present a formal academic accreditation or certification. Dorien says she is a member of the Netherlands’ Guild of Guides and follows its Code of Conduct, and she also works as an experiential facilitator with ADEPT, a two-year training programme for therapists learning to work with psychedelics.
Door of Perception does not publish a single programme price on its site. For guided truffle sessions, the provider says costs, availability and location are shared on enquiry; the session is offered as a trajectory of at least three meetings, including screening and preparation, rather than a one-off booking.
Learners and clients are positioned to walk away with safer preparation, clearer intention-setting, practical integration support, and a more grounded understanding of set, setting, ethics, and risk. For practitioner-facing work, the outcome is advisory rather than a credential: sharper judgement about safe and responsible facilitation, and more confidence about starting or refining a practice.
Linked Courses
2
Active Listings
0
Primary Formats
Live Classes, Self-paced
Programs linked directly to this provider in the Blossom course dataset.
By Door of Perception
Master Class on guiding truffle journeys safely and responsibly. Intended for starting or aspiring psychedelic guides and coaches with some prior experience in guiding, sitting, or harm reduction work.
By Door of Perception
The Meaningful DIY Journey course is designed for those ready to embark on their (first) psychedelic experience with confidence and the necessary tools for a safe and meaningful journey.
Delivery: Online + Self-paced
No medicine self-experience listed
Reference points selected from shared training modalities, learner audience, level, delivery format, pricing, and location.